{"id":247910,"date":"2026-09-11T11:30:25","date_gmt":"2026-09-11T08:30:25","guid":{"rendered":"https:\/\/azbuki.bg\/?p=247910"},"modified":"2026-09-11T11:30:25","modified_gmt":"2026-09-11T08:30:25","slug":"dynamic-programming-for-assessing-the-effectiveness-of-intelligent-transport-systems-in-achieving-sustainable-development-goals","status":"publish","type":"post","link":"https:\/\/azbuki.bg\/en\/xxvii-international-scientific-conference-transport-2025\/dynamic-programming-for-assessing-the-effectiveness-of-intelligent-transport-systems-in-achieving-sustainable-development-goals\/","title":{"rendered":"Dynamic Programming for Assessing the Effectiveness of Intelligent Transport Systems in Achieving Sustainable Development Goals"},"content":{"rendered":"<p><strong>Christina Nikolova, Marta Klisurova<br \/>\n<\/strong><em>University of National and World Economy, Sofia, Bulgaria<\/em><\/p>\n<p><a href=\"https:\/\/doi.org\/10.53656\/isct-2025.12\">https:\/\/doi.org\/10.53656\/isct-2025.12<\/a><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignleft wp-image-146829\" src=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2025\/03\/pdf-icon.jpg\" alt=\"\" width=\"32\" height=\"40\" srcset=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2025\/03\/pdf-icon.jpg 1532w, https:\/\/azbuki.bg\/wp-content\/uploads\/2025\/03\/pdf-icon-239x300.jpg 239w, https:\/\/azbuki.bg\/wp-content\/uploads\/2025\/03\/pdf-icon-817x1024.jpg 817w, https:\/\/azbuki.bg\/wp-content\/uploads\/2025\/03\/pdf-icon-768x963.jpg 768w, https:\/\/azbuki.bg\/wp-content\/uploads\/2025\/03\/pdf-icon-1226x1536.jpg 1226w, https:\/\/azbuki.bg\/wp-content\/uploads\/2025\/03\/pdf-icon-750x940.jpg 750w, https:\/\/azbuki.bg\/wp-content\/uploads\/2025\/03\/pdf-icon-1140x1429.jpg 1140w\" sizes=\"(max-width: 32px) 100vw, 32px\" \/><br \/>\n<a href=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_article_12.pdf\">PDF<\/a><\/p>\n<p><em>Pages 149-161<\/em><\/p>\n<p><strong>Abstract. <\/strong>In line with Goal 11 of the United Nations Sustainable Development Goals (SDGs), which seeks to ensure safe, accessible, and sustainable transportation systems for everyone by 2030, this study investigates the effect of Intelligent Transport Systems (ITS) on key indicators of sustainable urban development. The paper discusses the SDGs adopted by the UN in 2015, focusing on the social, economic, and environmental aspects of sustainability, especially Goal 11.<\/p>\n<p>The research systematically identifies and classifies key indicators for sustainable transport, aligning each with Goal 11 of the United Nations&#8217; Sustainable Development Goals. It evaluates how different types of ITS influence these indicators, emphasizing their role in improving public welfare. A city-based case study is included, where a dynamic programming method is employed to optimize the outcomes of ITS implementation. The empirical results demonstrate the potential to achieve optimal results from various ITS solutions, as measured by impact coefficients related to each indicator.<\/p>\n<p>The study concludes with a discussion of potential benefits related to ITS deployment, along with opportunities for future development within the broader context of sustainable urban mobility.<\/p>\n<p><em>Keywords:<\/em> intelligent transport systems; dynamic programming; sustainable development goals; sustainable transport indicators; optimization of ITS impacts<\/p>\n<p>&nbsp;<\/p>\n<ol>\n<li><strong> Introduction<\/strong><\/li>\n<\/ol>\n<p>With growing urbanization and increased traffic in cities, implementing Intelligent Transport Systems (ITS) is becoming crucial for sustainable transportation and mobility. These systems have great potential to help achieve the Sustainable Development Goals (SDGs), especially in urban areas, and to enhance public welfare. They can contribute to creating smarter, greener, and more inclusive cities. Their impacts can be viewed from various perspectives, including environmental, social, economic, and technological. In this context, implementing ITS provides technological solutions that can optimize traffic flow, improve public transportation, and lower environmental impact [1]. The main aim of this report is to introduce a model based on dynamic programming that evaluates the impacts of different types of ITS on sustainable development.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<ol start=\"2\">\n<li><strong> Key components of intelligent transport systems <\/strong><\/li>\n<\/ol>\n<p>The main components of ITS include technologies, infrastructure, and software solutions that work together to enhance the efficiency, safety, and sustainability of transportation. The primary and most commonly used types of ITS in urban environments are:<\/p>\n<p>\u2013 Adaptive traffic lights (Smart Traffic Lights);<\/p>\n<p>\u2013 Real-time traffic management systems (RTMS) \u2013 including <strong>intelligent traffic light<\/strong> systems, <strong>adaptive intersection control systems<\/strong>, <strong>speed management systems<\/strong>, etc. [2];<\/p>\n<p>\u2013 Intelligent public transport systems \u2013 include real-time tracking systems, information boards at stops, integrated tickets and payments, etc.;<\/p>\n<p>\u2013 Passenger and driver information systems \u2013 include <strong>mobile applications<\/strong>, <strong>in-vehicle navigation systems<\/strong>, <strong>dynamic electronic displays<\/strong>, etc.;<\/p>\n<p>\u2013 Geolocation and sensor technologies \u2013 include <strong>GPS\/GNSS<\/strong>, <strong>cameras and radars<\/strong>, <strong>road surface sensors<\/strong>, etc.;<\/p>\n<p>\u2013 Automated toll collection systems;<\/p>\n<p>\u2013 Communication technologies (V2X) \u2013 include <strong>V2V (<\/strong>vehicle-to-vehicle communication<strong>)<\/strong>, <strong>V2I (<\/strong>vehicle-to-infrastructure interaction<strong>)<\/strong>, <strong>V2P (<\/strong>detection and protection of pedestrians through sensors and mobile devices<strong>)<\/strong>;<\/p>\n<p>\u2013 Data management and analysis centers \u2013 including traffic control centers, big data analysis systems, artificial intelligence, and machine learning [3];<\/p>\n<p>\u2013 Cybersecurity and data protection, etc. [4, 5];<\/p>\n<p>&nbsp;<\/p>\n<p>ITS integrates various components into a connected, intelligent system that promotes sustainable and safe mobility. The core of their effectiveness lies in the combination of hardware (sensors, cameras), software (analysis and control), and communications (V2X) [6].<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"3\">\n<li><strong> Key indicators for sustainable development<\/strong><\/li>\n<\/ol>\n<p>Key indicators for evaluating sustainable transport development include economic, environmental, and social factors. They are used to measure progress toward a transportation system that is efficient, accessible, safe, and environmentally friendly.<\/p>\n<p>Leading groups of indicators and indicators for sustainable development:<\/p>\n<ul>\n<li>Environmental:<\/li>\n<\/ul>\n<p>\u2013 Greenhouse gas (GHG) emissions \u2013 CO2, CH4, N2O from the transport sector.<\/p>\n<p>\u2013 Noise pollution \u2013 especially in urban and suburban areas.<\/p>\n<p>\u2013 Energy consumption \u2013 total and by type (fossil fuels vs. renewable sources)<\/p>\n<p>\u2013 Air quality \u2013 levels of NO\u2093, PM10, PM2.5, SO<sub>2<\/sub>, ozone.<\/p>\n<ul>\n<li>Economic:<\/li>\n<\/ul>\n<p>\u2013 Transport efficiency \u2013 energy consumption per passenger or tonne-kilometer.<\/p>\n<p>\u2013 Levels of intermodality \u2013 integration between different modes of transport.<\/p>\n<p>\u2013 Investments in transport infrastructure, as a share of GDP or per capita.<\/p>\n<p>\u2013 Internal and external costs \u2013 maintenance costs, delays, pollution, accidents.<\/p>\n<ul>\n<li>Social:<\/li>\n<\/ul>\n<p>\u2013 Transport accessibility \u2013 to ensure access to public services, jobs, and education.<\/p>\n<p>\u2013 Transport safety \u2013 number and severity of traffic accidents, injuries, and fatalities.<\/p>\n<p>\u2013 Social justice \u2013 equal access for vulnerable groups (older adults, people with disabilities, low-income households).<\/p>\n<p>\u2013 Quality of transport services \u2013 reliability, frequency, comfort.<\/p>\n<p>\u2013 Travel time \u2013 average time spent traveling to work or services.<\/p>\n<p>Behavior and mobility indicators:<\/p>\n<p>\u2013 Share of trips by mode of transport \u2013 public, car, bicycle, walking.<\/p>\n<p>\u2013 Number of vehicles per 1,000 people \u2013 an indicator of motorization.<\/p>\n<p>\u2013 Development of cycling and walking infrastructure \u2013 network length and convenience.<\/p>\n<p>These indicators and metrics are sourced from data provided by the UN \u2013 UN Sustainable Development Goals (SDG Indicators), Eurostat \u2013 Sustainable Development Indicators (EU SDIs), the National Statistical Institute (NSI) \u2013 Sustainable Development Section, European Environment Agency \u2013 Environmental Indicators, ITU &amp; UNECE \u2013 Smart Sustainable Cities Indicators, and other organizations.<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"4\">\n<li><strong> Sustainable Development Goals<\/strong><\/li>\n<\/ol>\n<p>In 2015, the UN adopted its Sustainable Development Agenda for the period up to 2030. It includes 17 Sustainable Development Goals (SDGs) and 169 sub-goals, with progress tracked through 232 indicators. The agenda seeks to promote sustainable social, economic, and environmental development worldwide by 2030. This report highlights the opportunities to use intelligent transport systems to achieve Goal 11 \u2013 Sustainable Cities and Communities, which aims to ensure safe, accessible, and sustainable transportation for all in urban areas.<\/p>\n<p>To achieve SDG 11, cities and other settlements need to be renewed and planned in ways that ensure equal access to basic services, energy, housing, transportation, and green public spaces, while also reducing resource consumption and environmental impact.<\/p>\n<p>Monitoring SDG 11 within the EU transport policy context involves analyzing changes in urban and community quality of life, efforts to promote sustainable mobility, and the environmental impacts of transport. Current EU assessments indicate moderate progress toward SDG 11 over the past five years [7]. While there have been improvements in urban and community quality of life, trends in sustainable mobility remain somewhat unfavorable. The environmental impact outlook is mixed, with both sustainable and unsustainable developments noted [7].<\/p>\n<p>Each country&#8217;s advancement toward this goal is tracked with the following indicators:<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Population living in households that consider themselves to be affected by noise, by poverty status<\/strong><\/li>\n<\/ul>\n<p>The Environmental Noise Directive is the EU&#8217;s key tool for identifying and addressing noise pollution [8]. It focuses on three main areas: assessing exposure to environmental noise, providing the public with access to information about environmental noise and its effects, preventing and reducing environmental noise where needed\u2014especially where exposure could harm human health\u2014and maintaining the quality of environmental noise where it is beneficial. The indicator tracks the percentage of the population that reports being affected by noise from transportation or other sources. In 2023, 18.2% of the EU population experienced noise disturbance [7].<\/p>\n<ul>\n<li><strong>Road fatalities by type of road<\/strong><\/li>\n<\/ul>\n<p>The indicator tracks the number of deaths caused by road accidents, including those involving road users \u2013 drivers, passengers of motor vehicles, bicycles, and pedestrians. People who die within 30 days of a traffic accident are counted as traffic-related deaths. In 2023, 20,380 people died in traffic accidents across the EU [7].<\/p>\n<ul>\n<li><strong>Premature death due to exposure to particulate matter<\/strong><\/li>\n<\/ul>\n<p>This indicator estimates the number of premature deaths caused by long-term exposure to PM2.5 levels above five \u00b5g\/m\u00b3 (the World Health Organization&#8217;s recommended level). Two hundred thirty-nine thousand people in the EU died prematurely in 2022 due to PM2.5 exposure [7].<\/p>\n<ul>\n<li><strong>Share of rail and inland waterways in domestic freight transport<\/strong><\/li>\n<\/ul>\n<p>Transport should be organized to minimize environmental impact. This indicator shows the share of buses and trains within total inland passenger transport, measured in passenger-kilometers (pkm). According to the Eurostat database, 16.6 % of passenger traffic in passenger-kilometers was carried out by buses and trains in 2022. The share of cars in passenger traffic accounts for 83.4 % which put them in a dominant position on the passenger market [7].<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<ol start=\"5\">\n<li><strong> Link between the leading indicators for sustainable transport and Sustainable Development Goal 11. <\/strong><\/li>\n<\/ol>\n<p>The following table assesses the impact of various intelligent transport systems on sustainable transport indicators, emphasizing their role in improving public welfare. Based on this table, a judgment can be made about the significance of each ITS system&#8217;s effect in achieving a specific goal.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>Table 1. <\/strong>Assessment of the impact of different types of ITS on sustainable transport indicators related to Goal 11<\/p>\n<table width=\"605\">\n<tbody>\n<tr>\n<td rowspan=\"2\" width=\"107\"><strong>Sustainable Development Goals <\/strong><\/td>\n<td rowspan=\"2\" width=\"138\"><strong>Indicator measuring progress<\/strong><\/td>\n<td colspan=\"2\" width=\"359\"><strong>Impact of ITS (benefits)<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"170\"><strong>Type of system <\/strong><\/p>\n<p><strong>(product or service)<\/strong><\/td>\n<td width=\"189\"><strong>Contribution\/Effect<\/strong><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"37\" width=\"107\"><strong>GOAL 11 <\/strong>\u2013Sustainable cities and communities<\/p>\n<p>&nbsp;<\/td>\n<td rowspan=\"8\" width=\"138\">Population living in households that consider themselves to be affected by noise, by poverty level<\/td>\n<td width=\"170\">Reactive traffic management and control<\/td>\n<td rowspan=\"8\" width=\"189\">Smooth travel for all, leading to reduced noise levels<\/p>\n<p>Direct and targeted information to road users, leading to informed travel choices.<\/p>\n<p>Internal and external costs<\/p>\n<p>Social equity<\/p>\n<p><strong>Economic effect<\/strong><\/p>\n<p><strong>Social effect<\/strong><\/p>\n<p><strong>Environmental impact<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Predictive traffic management and control<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Information for travelers<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Parking management and information<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Road user charging<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Fleet management systems<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Demand-responsive transport<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Mobility as a service<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"11\" width=\"138\">Road traffic fatalities by type of road &#8211; Number of fatalities in road traffic accidents<\/td>\n<td width=\"170\">Automatic number plate recognition system (ANPR, CCTV)<\/td>\n<td rowspan=\"11\" width=\"189\">Reduction in road accidents and number of fatalities (in %)<\/p>\n<p>Transport safety<\/p>\n<p>Quality of transport services<\/p>\n<p>Reduced internal and external costs<\/p>\n<p><strong>Economic effect<\/strong><\/p>\n<p><strong>Social impact<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Reactive traffic management and control<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Predictive traffic management and control<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Priority for public transport and emergency vehicles<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Mobility as a service<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Traveler information<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Red light running and parking enforcement<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Dynamic route guidance<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Road user charging<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Electronic tickets<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Electronic payment<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"11\" width=\"138\">Premature deaths due to exposure to fine particulate matter<\/td>\n<td width=\"170\">Reactive traffic management and control<\/td>\n<td rowspan=\"11\" width=\"189\">Improved air quality<\/p>\n<p>Improved transport efficiency<\/p>\n<p>Reduced internal and external costs<\/p>\n<p>Social equity<\/p>\n<p><strong>Economic effect<\/strong><\/p>\n<p><strong>Social impact <\/strong><\/p>\n<p><strong>Environmental impact<\/strong><\/p>\n<p>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Predictive traffic management and control<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Information for travelers<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Parking management and information<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Red light running and parking enforcement<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Dynamic route guidance<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Road user charging<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Fleet management systems<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Demand-responsive transport<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Electronic payment<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Mobility as a service<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"7\" width=\"138\">Share of rail and inland waterways in domestic freight transport<\/td>\n<td width=\"170\">Real-time traffic management systems (RTMS)<\/td>\n<td rowspan=\"7\" width=\"189\">Reduction in delays (in %)<\/p>\n<p>Increase in public transport use (in %)<\/p>\n<p>Accessibility of transport<\/p>\n<p>Quality of transport services<\/p>\n<p>Travel time<\/p>\n<p>Transport efficiency<\/p>\n<p>Levels of intermodality<\/p>\n<p><strong>Economic impact<\/strong><\/p>\n<p><strong>Social impact <\/strong><\/p>\n<p><strong>Environmental impact<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Information for travelers<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Electronic tickets<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Electronic payment<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Transportation that meets demand<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Fleet management systems<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">Mobility as a service<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Source: <\/em>Systematization of authors based on the EU Strategies and Policies (https:\/\/commission.europa.eu\/strategy-and-policy\/sustainable-development-goals\/eu-and-united-nations-common-goals-sustainable-future_bg) [9]<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"6\">\n<li><strong> Dynamic programming approach and its application in transport<\/strong><\/li>\n<\/ol>\n<p>Dynamic programming (optimization) relies on the principle of optimality, introduced by Richard Bellman in 1962: \u201cA policy is optimal if, for a given stage, regardless of decisions made earlier, the decisions to be made form an optimal policy, considering the results of previous stages.\u201d [10] These methods are extensively used in transport planning. Their practical application often results in significant economic benefits. A key feature of dynamic programming problems is the strict need to observe the sequence of individual operations due to the time factor [11]. Solving such problems involves a multi-stage decision-making process, where identifying the optimal choice is divided into several sub-stages. In this approach, the goal is not to find isolated optimal solutions for each subtask but to determine the overall optimal solution that minimizes costs over the entire period. The implementation of the dynamic programming approach involves two stages:<\/p>\n<p>\u2013 Conditional optimization (moving from step to step);<\/p>\n<p>\u2013 Actual optimization (moving from step 1 to step n).<\/p>\n<p>The principles of dynamic programming can also be used to solve problems that are not multi-stage but rely on the decision-making process itself [12].<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<ol start=\"7\">\n<li><strong> Practical application of the dynamic programming approach to optimize the effects of ITS implementation<\/strong><\/li>\n<\/ol>\n<p>To demonstrate the capabilities of the dynamic programming approach in assessing the impact of implementing intelligent transport systems in an urban environment on achieving Sustainable Development Goal 11, an example has been developed featuring four systems: the implementation of smart traffic lights, video surveillance at intersections, shared mobility as a service, and electronic toll collection. For the model, it is assumed that the budget needed for implementing these systems is BGN 50 million, distributed among the four selected systems. The costs must be equal to or less than this budget.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-247913 size-full\" src=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula01.png\" alt=\"\" width=\"157\" height=\"24\" srcset=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula01.png 157w, https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula01-150x24.png 150w\" sizes=\"(max-width: 157px) 100vw, 157px\" \/><\/p>\n<p>where:<\/p>\n<p>x \u2013 configuration of selected ITS;<\/p>\n<p>C(x) \u2013 value\/cost of implementing x;<\/p>\n<p>B \u2013 budget.<\/p>\n<p>The empirical assessment of the impact (coefficients) of the systems is performed based on a method for obtaining the sustainable value, using a linear regression model for effects:<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-247914 size-full\" src=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula02.png\" alt=\"\" width=\"381\" height=\"70\" srcset=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula02.png 381w, https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula02-300x55.png 300w\" sizes=\"(max-width: 381px) 100vw, 381px\" \/><\/p>\n<p>where:<\/p>\n<p>Y \u2013 sustainable value (aggregate effect);<\/p>\n<p>Xi \u2013 level of implementation of ITS i;<\/p>\n<p>\u0392i \u2013 impact coefficient;<\/p>\n<p>\u03f5 \u2013 model error.<\/p>\n<p>The impact coefficients (\u03b2) for indicators such as reduction in traffic accidents, decrease in CO<sub>2<\/sub>, reduction in travel time, and increase in demand for public transport (PT) are not arbitrary; they are based on empirical data and statistical analysis. Data can be collected from various sources, including the Sofia Municipality, the traffic police, the National Statistical Institute, the Bulgarian Academy of Sciences, the Ministry of Regional Development and Public Works, as well as European Commission reports.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>Table 2. <\/strong>Impact coefficients (example values from empirical studies)<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"111\"><strong>ITS<\/strong><\/td>\n<td><strong>Coefficient for road accidents (\u03b2<sub>1<\/sub>)<\/strong><\/td>\n<td><strong>Coefficient for CO<sub>2<\/sub> (\u03b2<\/strong><strong>\u2082)<\/strong><\/td>\n<td><strong>Coefficient for time (\u03b2<\/strong><strong>\u2083)<\/strong><\/td>\n<td width=\"127\"><strong>Coefficient for public transport (\u03b2<sub>4<\/sub>) <\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"111\">Intelligent traffic lights<\/td>\n<td>-0.05<\/td>\n<td>-0.10<\/td>\n<td>-0.15<\/td>\n<td width=\"127\">0<\/td>\n<\/tr>\n<tr>\n<td width=\"111\">Traffic accident cameras<\/td>\n<td>-0.20<\/td>\n<td>0<\/td>\n<td>-0.05<\/td>\n<td width=\"127\">0<\/td>\n<\/tr>\n<tr>\n<td width=\"111\">Shared mobility as a service<\/td>\n<td>0<\/td>\n<td>-0.05<\/td>\n<td>-0.10<\/td>\n<td width=\"127\">+0.25<\/td>\n<\/tr>\n<tr>\n<td width=\"111\">Electronic charging<\/td>\n<td>0<\/td>\n<td>-0.20<\/td>\n<td>0<\/td>\n<td width=\"127\">+0.10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Source: <\/em>Authors&#8217; calculations<\/p>\n<p>&nbsp;<\/p>\n<p>To provide input data for the model, the effects of reducing road traffic accidents, lowering CO<sub>2<\/sub> emissions, saving time, and decreasing the use of private motor vehicles are also presented, along with the associated social, economic, or environmental benefits.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Table 3. <\/strong>Input data for the model (example values)<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"161\"><strong>ITS solution<\/strong><\/td>\n<td width=\"95\"><strong>Cost (million BGN)<\/strong><\/td>\n<td width=\"100\"><strong>Effect on road accidents<\/strong><\/td>\n<td width=\"80\"><strong>Effect on CO<sub>2<\/sub><\/strong><\/td>\n<td width=\"85\"><strong>Effect on time<\/strong><\/td>\n<td width=\"85\"><strong>Effect on vehicle use<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"161\">Smart traffic lights<\/td>\n<td width=\"95\">15<\/td>\n<td width=\"100\">5% \u2193<\/td>\n<td width=\"80\">10%<\/td>\n<td width=\"85\">15<\/td>\n<td width=\"85\">0<\/td>\n<\/tr>\n<tr>\n<td width=\"161\">Traffic accident cameras<\/td>\n<td width=\"95\">10<\/td>\n<td width=\"100\">20% \u2193<\/td>\n<td width=\"80\">0<\/td>\n<td width=\"85\">5% \u2193<\/td>\n<td width=\"85\">0<\/td>\n<\/tr>\n<tr>\n<td width=\"161\">Shared mobility as a service<\/td>\n<td width=\"95\">25<\/td>\n<td width=\"100\">0<\/td>\n<td width=\"80\">5% \u2193<\/td>\n<td width=\"85\">10<\/td>\n<td width=\"85\">25% \u2191<\/td>\n<\/tr>\n<tr>\n<td width=\"161\">Electronic charging<\/td>\n<td width=\"95\">20<\/td>\n<td width=\"100\">0<\/td>\n<td width=\"80\">20% \u2193<\/td>\n<td width=\"85\">0<\/td>\n<td width=\"85\">10% \u2191<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Source: <\/em>Authors&#8217; calculations<\/p>\n<p>&nbsp;<\/p>\n<p>A key requirement for using the dynamic programming approach is defining an optimal substructure. This involves selecting and combining the most effective solutions to the minor problems that comprise the main issue. These optimal substructures are described recursively. The purpose of the equation below is to illustrate how the overall effect is achieved when different intelligent transport systems are added to the model incrementally.<\/p>\n<p>The recursive equation is:<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-247915 size-full\" src=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula03.png\" alt=\"\" width=\"514\" height=\"26\" srcset=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula03.png 514w, https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula03-300x15.png 300w\" sizes=\"(max-width: 514px) 100vw, 514px\" \/><\/p>\n<p>where:<\/p>\n<p>E\u2099 is the cumulative effect after the implementation of the n-th ITS system;<\/p>\n<p>\u03b1\u1d62 are the weights of the indicators (e.g., Acc = 0.3, CO\u2082 = 0.3, time = 0.2, public transport PT = 0.2);<\/p>\n<p>P\u1d62\u2099 is the value of the respective indicator in the n-th ITS system.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Table 4. <\/strong>Accumulation of sustainable effects with the gradual addition of ITS to the model<\/p>\n<table width=\"605\">\n<tbody>\n<tr>\n<td width=\"187\"><strong>ITS System<\/strong><\/td>\n<td width=\"58\"><strong>\u2193 Acc (%)<\/strong><\/td>\n<td width=\"58\"><strong>\u2193 CO\u2082 (%)<\/strong><\/td>\n<td width=\"67\"><strong>\u2193 Time (%)<\/strong><\/td>\n<td width=\"49\"><strong>\u2191 PT (%)<\/strong><\/td>\n<td width=\"84\"><strong>Single effect<\/strong><\/td>\n<td width=\"104\"><strong>Cumulative effect<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Smart traffic lights<\/td>\n<td width=\"58\">5<\/td>\n<td width=\"58\">10<\/td>\n<td width=\"67\">15<\/td>\n<td width=\"49\">0<\/td>\n<td width=\"84\">7.5<\/td>\n<td width=\"104\">7.5<\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Traffic accident cameras<\/td>\n<td width=\"58\">20<\/td>\n<td width=\"58\">0<\/td>\n<td width=\"67\">5<\/td>\n<td width=\"49\">0<\/td>\n<td width=\"84\">7.0<\/td>\n<td width=\"104\">14.5<\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Shared mobility as a service<\/td>\n<td width=\"58\">0<\/td>\n<td width=\"58\">5<\/td>\n<td width=\"67\">10<\/td>\n<td width=\"49\">25<\/td>\n<td width=\"84\">8.5<\/td>\n<td width=\"104\">23.0<\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Electronic charging<\/td>\n<td width=\"58\">0<\/td>\n<td width=\"58\">20<\/td>\n<td width=\"67\">5<\/td>\n<td width=\"49\">10<\/td>\n<td width=\"84\">9.0<\/td>\n<td width=\"104\">32.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Source: <\/em>Authors&#8217; calculations<\/p>\n<p>&nbsp;<\/p>\n<p>The single effect column (F) in Table 4 displays the effect of each ITS system. The cumulative effect column (G) illustrates how the recurrence equation is implemented by adding the value from the previous row:<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-247916 size-full\" src=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula04.png\" alt=\"\" width=\"220\" height=\"48\" \/><\/p>\n<p>To simulate the effects of various ITS strategies in an optimization scenario for the city of Sofia, the function is maximized as follows:<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-247917 size-full\" src=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula05.png\" alt=\"\" width=\"603\" height=\"28\" srcset=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula05.png 603w, https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/transport_art12_formula05-300x14.png 300w\" sizes=\"(max-width: 603px) 100vw, 603px\" \/><\/p>\n<p>Where \u03b1 are priority weights. For example:<\/p>\n<p>\u2013 \u03b1\u2081 = 0.3 (Acc);<\/p>\n<p>\u2013 \u03b1\u2082 = 0.3 (CO\u2082);<\/p>\n<p>\u2013 \u03b1\u2083 = 0.2 (time);<\/p>\n<p>\u2013 \u03b1\u2084 = 0.2 (public transport).<\/p>\n<p>When executing a scenario that includes the selection of smart traffic lights (BGN 15 million), traffic accident cameras (BGN 10 million), and shared mobility as a service (BGN 25 million) within a BGN 50 million budget, an overall impact is achieved, as shown in Table 5.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Table 5. <\/strong>Calculations of the aggregate effect of implementing the four systems<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"132\"><strong>Indicator<\/strong><\/td>\n<td width=\"180\"><strong>Amount of effect<\/strong><\/td>\n<td><strong>Weight<\/strong><\/td>\n<td><strong>Contribution<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"132\">Acc<\/td>\n<td width=\"180\">5% + 20% =<strong> 25% \u2193<\/strong><\/td>\n<td>0.3<\/td>\n<td>7.5<\/td>\n<\/tr>\n<tr>\n<td width=\"132\">CO<sub>2<\/sub><\/td>\n<td width=\"180\">10% + 5% =<strong> 15% \u2193<\/strong><\/td>\n<td>0.3<\/td>\n<td>4.5<\/td>\n<\/tr>\n<tr>\n<td width=\"132\">Time<\/td>\n<td width=\"180\">15% + 5% + 10% =<strong> 30% \u2193<\/strong><\/td>\n<td>0.2<\/td>\n<td>6.0<\/td>\n<\/tr>\n<tr>\n<td width=\"132\">Public transport<\/td>\n<td width=\"180\">0 + 0 + 25% =<strong> 25% \u2191<\/strong><\/td>\n<td>0.2<\/td>\n<td>5.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Source: <\/em>Authors&#8217; calculations<\/p>\n<p>&nbsp;<\/p>\n<p>Based on the calculation of the overall effect of implementing the four systems, a total sustainable value (Y) of 23 conditional units is established.<\/p>\n<p>To identify the most effective values for reducing traffic accidents using various ITS systems within the available budget, we follow a step-by-step approach. The results of the calculations are shown in Table 6 below.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Table 6. <\/strong>Result of a step-by-step approach to determine optimal values for road accident reduction<br \/>\nwithin a limited budget<\/p>\n<table width=\"602\">\n<tbody>\n<tr>\n<td width=\"169\"><strong>ITS system<\/strong><\/td>\n<td width=\"85\"><strong>Coefficient \u03b2<\/strong><\/td>\n<td width=\"85\"><strong>Level (0\/1)-X<\/strong><\/td>\n<td width=\"95\"><strong>Budget (BGN)<\/strong><\/td>\n<td width=\"85\"><strong>Sustainable value Y=\u03b2\u00b7X<\/strong><\/td>\n<td width=\"84\"><strong>Expense<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"169\">Smart traffic lights<\/td>\n<td width=\"85\">2<\/td>\n<td width=\"85\">1<\/td>\n<td width=\"95\">15,000,000<\/td>\n<td width=\"85\">2.5<\/td>\n<td width=\"84\">15,000,000<\/td>\n<\/tr>\n<tr>\n<td width=\"169\">Traffic accident cameras<\/td>\n<td width=\"85\">1.8<\/td>\n<td width=\"85\">1<\/td>\n<td width=\"95\">10,000,000<\/td>\n<td width=\"85\">1.8<\/td>\n<td width=\"84\">10,000,000<\/td>\n<\/tr>\n<tr>\n<td width=\"169\">Shared mobility as a service<\/td>\n<td width=\"85\">2.2<\/td>\n<td width=\"85\">1<\/td>\n<td width=\"95\">25,000,000<\/td>\n<td width=\"85\">2.2<\/td>\n<td width=\"84\">25,000,000<\/td>\n<\/tr>\n<tr>\n<td width=\"169\">Electronic charging<\/td>\n<td width=\"85\">3<\/td>\n<td width=\"85\">0<\/td>\n<td width=\"95\">20,000,000<\/td>\n<td width=\"85\">0<\/td>\n<td width=\"84\">0<\/td>\n<\/tr>\n<tr>\n<td width=\"169\"><\/td>\n<td width=\"85\"><\/td>\n<td width=\"85\"><\/td>\n<td width=\"95\"><strong>Total expenditure:<\/strong><\/td>\n<td width=\"85\"><\/td>\n<td width=\"84\"><strong>50,000,000<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"169\"><\/td>\n<td width=\"85\"><\/td>\n<td width=\"85\"><\/td>\n<td width=\"95\"><strong>Total \u2193 Acc:<\/strong><\/td>\n<td width=\"85\"><strong>6.5<\/strong><\/td>\n<td width=\"84\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Source: <\/em>Authors&#8217; calculations<\/p>\n<p>&nbsp;<\/p>\n<p>The results from the calculations allow us to determine a total sustainable value (Y) of 6.5 conditional units.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Impact on sustainability indicators<\/strong><\/p>\n<p>The practical example demonstrating the application of the dynamic programming approach in evaluating the impact of implementing the four types of ITS in the scenario above shows that by using an optimal combination of intelligent traffic light systems, traffic accident cameras, and shared mobility as a service, a total reduction in traffic accidents of 6.5 (sustainable value) can be achieved within the specified budget constraint (see Figure 1). This way, it becomes possible to evaluate how ITS contributes to lowering the number of fatalities from traffic accidents, which aligns with SDGs 3 and 11.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-247918 size-full\" src=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/\u21166-77-doklad-eng_fig.1.jpg\" alt=\"\" width=\"400\" height=\"229\" srcset=\"https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/\u21166-77-doklad-eng_fig.1.jpg 400w, https:\/\/azbuki.bg\/wp-content\/uploads\/2026\/09\/\u21166-77-doklad-eng_fig.1-300x172.jpg 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Source: <\/em>Based on authors&#8217; calculations<\/p>\n<p style=\"text-align: center;\"><strong>Figure 1. <\/strong>Impact of ITS on the road accidents<\/p>\n<p>In summary, the results of testing the dynamic programming approach in evaluating the impact of ITS implementation on achieving sustainable development goals lead to the following conclusions:<\/p>\n<p>\u2013 The dynamic programming model enables the simulation of scenarios with various combinations of ITSs within budget constraints.<\/p>\n<p>\u2013 The optimal combo for Sofia in the example includes: smart traffic lights, traffic accident cameras, and shared mobility as a service.<\/p>\n<p>\u2013 Using empirical impact coefficients enables quantitative evaluation and prioritization of investments to promote sustainable transport development.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>Conclusions <\/strong><\/p>\n<p>The EU&#8217;s sustainable transport system goals aim to create an intelligent, flexible, and adaptable system that responds to the ever-changing patterns and needs within the transport sector. It is based on technological advances to ensure seamless, safe, and secure connectivity for all European citizens. The results of the presented study and empirical testing confirm that dynamic programming can be used to optimize the effective selection and implementation of ITS in urban environments, even with budget constraints. The effectiveness of this methodology demonstrates that dynamic programming is a powerful tool for sustainable urban planning. Future research and development directions include calibrating the model with real data from sources such as the NSI, Sofia Municipality, and the Traffic Police, as well as adding GIS analysis for spatial assessments. Municipalities across the country can also utilize this model for planning and making informed decisions related to transport planning, policy development, and operational adjustments. The use of data from ITS enables the development of a follow-up model based on the real effects of system application over time, clearly demonstrating the achievement of sustainable development goals, especially Goal 11.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>REFERENCES<\/strong><\/p>\n<p>[1] NIKOLOVA C., Improving Sustainable Mobility through Intelligent Transport Systems Deployment. In: Reyhanoglu, M. (Ed.). Modeling and Control of Autonomous Systems, pp. 59 \u2013 78, 2025, Available at: https:\/\/www.intechopen.com\/chapters\/1198156.<\/p>\n<p>[2] MUBASHIR I., Analysis of AI-Enabled Adaptive Traffic Control Systems for Urban Mobility Optimization Through Intelligent Road Network Management. Review of Applied Science and Technology, 4(2), 207 \u2013 232, 2025, https:\/\/doi.org\/10.63125\/358pgg63.<\/p>\n<p>[3] MUSA, A. A., MALAMI, S. I., ALANAZI, F., OUNAIES, W., ALSHAMMARI, M., HARUNA, S. I., Sustainable Traffic Management for Smart Cities Using Internet-of-Things-Oriented Intelligent Transportation Systems (ITS): Challenges and Recommendations. Sustainability, 15(13), 9859, 2023, https:\/\/doi.org\/10.3390\/su15139859.<\/p>\n<p>[4] PUZIO, E., DRO\u017bD\u017b, W., KOLON, M., The Role of Intelligent Transport Systems and Smart Technologies in Urban Traffic Management in Polish Smart Cities. Energies, 18(10), 2580, 2025, https:\/\/doi.org\/10.3390\/en18102580.<\/p>\n<p>[5] ELASSY M., AL-HATTAB M., TAKRURI M., SUFIAN B., Intelligent transportation systems for sustainable smart cities, Transportation Engineering, Volume 16, 100252, 2024, ISSN 2666-691X, https:\/\/doi.org\/10.1016\/j.treng.2024.100252.<\/p>\n<p>[6] KIELA, K., BARZDENAS, V., JURGO, M., MACAITIS, V., RAFANAVICIUS, J., VASJANOV, A., KLADOVSCIKOV, L., NAVICKAS, R., Review of V2X\u2013IoT Standards and Frameworks for ITS Applications. Applied Sciences, 10(12), 4314, 2020, https:\/\/doi.org\/10.3390\/app10124314.<\/p>\n<p>[7] EUROSTAT -Sustainable development in the European Union \u2013 Monitoring report on progress towards the SDGs in an EU context (2025 edition) \u2013 [online] 4 June 2025 Available from: https:\/\/ec.europa.eu\/eurostat\/web\/products-flagship-publications\/w\/ks-01-24-018 [Accessed: July 02, 2025].<\/p>\n<p>[8] OFFICIAL JOURNAL. Directive 2002\/49\/EC of the European Parliament and of the Council of 25 June 2002 relating to the assessment and management of environmental noise &#8211; Declaration by the Commission in the Conciliation Committee on the Directive relating to the evaluation and management of environmental noise, published 08.07.2002, pp. 12 \u2013 25. Available from: https:\/\/eur-lex.europa.eu\/legal-content\/EN\/TXT\/?uri=CELEX%3A02002L0049-20210729, [Accessed: June 05, 2025].<\/p>\n<p>[9] EUROPEAN COMMISSION. Strategy and policy \u2013 [online] Available from: https:\/\/commission.europa.eu\/strategy-and-policy\/sustainable-development-goals\/eu-and-united-nations-common-goals-sustainable-future_bg, [Accessed: July 03, 2025].<\/p>\n<p>[10] BELLMAN, R., The theory of dynamic programming. \u2013 Bulletin of the American Mathematical Society, vol.60, No.6., 1954, Retrieved November 5, 2020, Available from https:\/\/projecteuclid.org\/euclid.bams\/1183519147.<\/p>\n<p>[11] Mutafchiev L., VASSILEV E., Economic and mathematical methods and models in transport, University Press Economics, Sofia, 15.06.1999, ISBN 954-494-365-X.<\/p>\n<p>[12] Bellman, R., Dreyfus, S., Applied dynamic programming. Princeton: Princeton University Press, 2015, ISBN: 9781400874651.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: right;\"><strong>Prof. Dr. Christina Nikolova<\/strong><\/p>\n<p style=\"text-align: right;\">ORCID iD: 0000-0002-0966-5872<\/p>\n<p style=\"text-align: right;\">Department of Transport and Energy Economics, University of National and World Economy<\/p>\n<p style=\"text-align: right;\">19, Osmi Dekemvri St., Sofia, Bulgaria<\/p>\n<p style=\"text-align: right;\">E-mail: hrnikolova@unwe.bg<\/p>\n<p style=\"text-align: right;\">\n<p style=\"text-align: right;\"><strong>Marta Klisurova, PhD student<\/strong><\/p>\n<p style=\"text-align: right;\">ORCID iD: 0009-0009-5346-4777<\/p>\n<p style=\"text-align: right;\">Department of Transport and Energy Economics, University of National and World Economy<\/p>\n<p style=\"text-align: right;\">19, Osmi Dekemvri St., Sofia, Bulgaria<\/p>\n<p style=\"text-align: right;\">E-mail: marta.klisurova@unwe.bg<\/p>","protected":false},"excerpt":{"rendered":"<p>Christina Nikolova, Marta Klisurova University of National and World Economy, Sofia, Bulgaria https:\/\/doi.org\/10.53656\/isct-2025.12 PDF Pages 149-161 Abstract. In line with Goal 11 of the United Nations Sustainable Development Goals (SDGs), which seeks to ensure safe, accessible, and sustainable transportation systems for everyone by 2030, this study investigates the effect of Intelligent Transport Systems (ITS) on [&hellip;]<\/p>","protected":false},"author":124332423427287,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jnews-multi-image_gallery":[],"jnews_single_post":[],"jnews_primary_category":[]},"categories":[19875],"tags":[11794,19950,19953,19951,19952],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dynamic Programming for Assessing the Effectiveness of Intelligent Transport Systems in Achieving Sustainable Development Goals - \u0410\u0437-\u0431\u0443\u043a\u0438<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/azbuki.bg\/xxvii-international-scientific-conference-transport-2025\/dynamic-programming-for-assessing-the-effectiveness-of-intelligent-transport-systems-in-achieving-sustainable-development-goals\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dynamic Programming for Assessing the Effectiveness of Intelligent Transport Systems in Achieving Sustainable Development Goals - \u0410\u0437-\u0431\u0443\u043a\u0438\" \/>\n<meta property=\"og:description\" content=\"Christina Nikolova, Marta Klisurova University of National and World Economy, Sofia, Bulgaria https:\/\/doi.org\/10.53656\/isct-2025.12 PDF Pages 149-161 Abstract. 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