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types of traffic management system

Parameters: inflow rate, number of waiting vehicles at current lane, number of waiting vehicles at adjacent lane, priority vehicle present (flag), lane on which priority vehicle present, fixed timer system output (in seconds), fuzzy system output (in seconds), ANFI S output t (in second ds), lane to be served by fixed timer system, lane to be served by ANFIS. Examples of guiding signs include tourist attractions, school zones, and rest stops. Here, we discuss different techniques that use these features. These include the Internet of Things (IoT), machine learning (ML), microcontrollers, wireless sensor networks (WSNs), and fuzzy logic (FL), which are used to better control traffic in complex situations. Currently, the most commonly used sensors for obtaining object trajectories over a wide range are RFID and GPS, with GPS being the primary means of extracting vehicle trajectories. Check our Portfolio to find more cases of Vilmate cooperation on the topic of logistics and intelligent transportation. Avery, R.P. Computer VisionECCV 2016, Proceedings of the European Conference on Computer Vision, Amsterdam, The Netherlands, 1114 October 2016. But detecting vehicles breaking the speed limit usually requires a coordinated effort between different devices: typically, a traffic camera, a radar, and a supplemental light. Editors Choice articles are based on recommendations by the scientific editors of MDPI journals from around the world. Field Operational Tests On Variable Speed Limits In Work Zones (PDF 159KB ) - Describes the results of field tests carried out in Michigan to implement and analyze the effectiveness of VSL in work zones. Copenhagen, another high bicycle traffic city, also installed a similar system to prioritize traffic signals for city buses and cyclists. In contrast, the networked surveillance system, while still collecting location information, offers additional features and capabilities. To test how well the proposed method works, a typical intersection in the city of Lanzhou has been chosen. 228233. Aside from these components, we also discuss existing vehicle-related tools such as simulators that work to create realistic traffic scenes. Keeping track of several hypotheses allows the tracker to deal with background clutter, partial and complete occlusions, and recover from failure or momentary distraction. MESO stands for mesoscopic simulation model, and it is a type of simulation that utilizes the same input data as the primary SUMO model. Zeng, K.; Gong, Y.J. A typical scenario would include both inbound 11851192. Some of the previously mentioned traffic software applications, which will be covered in the next section, have received a lot of positive feedback for the precision of their data, the real-time traffic updates that they provide, and the user-friendly nature of their user interfaces. Connected vehicle: This up-and-coming technology enables vehicles to communicate directly with intersections. The data collection process begins with the deployment of vision sensors in the surveillance zone. To transform their municipalities around better traffic and transit flow a movement now widely known as mobility cities Top 12 Smart Cities in the U.S. - Smart Cities Examples 2020. NYC Intelligent Transportation Project Wins ITS-NY Award, Advancing ITS. [. In Proceedings of the 2020 IEEE International Conference on Information Technology, Big Data and Artificial Intelligence (ICIBA), Chongqing, China, 68 November 2020; Volume 1, pp. ; Liu, Y. A CSMP, or Corridor System Management Plan, is a comprehensive integrated management plan. With knowledge of technologies, there are many new opportunities for improving the efficiency and effectiveness of traffic management systems. 132137. The non-dominated sorting algorithm for artificial bee colonies has a higher chance of convergence than the other methods tested. 3: 583. Sun, Z.; Liu, C.; Qu, H.; Xie, G. A Novel Effective Vehicle Detection Method Based on Swin Transformer in Hazy Scenes. Traffic parameters: average queue length, average maximum queue length, average number of vehicle stops. In such cases, it may be necessary to explicitly detect and remove shadows to improve the performance of the system. Available online: Develop Location-Based Services. Industrial Pervasive Edge Computing-Based Intelligence IoT for Surveillance Saliency Detection. They provide surveillance, traffic count, track speed and time, spot delays or inadequacies, and mark the parameters of vehicles when needed. Proc. Simulation tools are important in evaluating the performance of traffic systems under various scenarios. SVB Grid Resiliency Cocktail Hour Part II, European Parliamentary Research Service Blog. A real-time traffic control algorithm, referred to as D-SPORT (dynamic signal priority optimization), has been developed with the aim of minimizing transit vehicle delays and increasing schedule adherence. In order to achieve this, advanced predictive models and algorithms can be utilized that can effectively model the complex dynamics of road-related networks and account for various factors that impact the movement of vehicles, such as traffic flow, road geometry, weather conditions, and more. How Would Surround Vehicles Move? They give life to varicolored peoples interactions. 11901199. The vehicles texture is apparent in bright lighting circumstances, but the majority of the vehicles data are not visible in dim lighting, such as at night. Different discriminative classifiers such as boosting, SVM, and deep neural networks (DNNs) are used for vehicle detection. Waze is a useful tool for ITMS to increase traffic efficiency and safety since it can inform users about road closures, accidents, and other occurrences. If the spatial occupancy of vehicles is assumed, by assuming there is no bus and there are two cars, it is used to calculate the departure rate and gives a better result than counting vehicles. You are accessing a machine-readable page. In Proceedings of the 2015 International Symposium on Consumer Electronics (ISCE), Madrid, Spain, 2426 June 2015; IEEE: Madrid, Spain, 2015; pp. Object Recognition from Local Scale-Invariant Features. Get the help you need to keep your Digi solutions running smoothly. Vehicle Trajectory Prediction by Integrating Physics-and Maneuver-Based Approaches Using Interactive Multiple Models. Parameters: queue length and waiting time per vehicle. [, The logo of a vehicle is also an essential component of vehicle identification because it cannot be simply altered. People traffic Shi, W.; Yu, C.; Ma, W.; Wang, L.; Nie, L. Simultaneous Optimization of Passive Transit Priority Signals and Lane Allocation. All the data is real-time, and any connected vehicle or a fleet can conduct direct communication with the service databases at any moment. The schedule is responsive to the rush-hour peaks and the passenger flow. Gaonkar, N.U. Zhang, J.; Xu, C.; Gao, Z.; Rodrigues, J.J.; de Albuquerque, V.H.C. These applications provide navigation, real-time traffic information, route optimization, and other features to the intelligent traffic management system (ITMS) to help drivers make informed decisions on the road. So, to address this challenge, the intelligent traffic management system (ITMS) is used to manage traffic on road networks. WebCoupled with the rise of Deep Learning, the wealth of data and enhanced computation capabilities of Internet of Vehicles (IoV) components enable effective Artificial Intelligence (AI) based models to be built. 04TH8749), Washington, DC, USA, 36 October 2004; pp. The problem is addressed in this study by employing a hybrid reinforcement learning variant, specifically tailoring the multi-pass DQN hybrid parameterized deep Q-networks to jointly control the TSC phase and timing. These include genetic algorithms (GAs), cultural algorithms (CAs), simulated annealing (SA), ant colony optimization (ACO), differential evolution (DE), particle swarm optimization (PSO), and tabu search (TS). In recent years, advancements in imaging technologies have increased the visual quality of captured traffic scenes. In Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops, Long Beach, CA, USA, 1520 June 2019; pp. Furthermore, video footage by itself provides little value as cities can only resort to a reactive approach after traffic incidents have occurred. Hygraph is the best R. Tayara, H.; Soo, K.G. All articles published by MDPI are made immediately available worldwide under an open access license. The Smart Traffic Management can include a connected vehicle roadside unit for this purpose. Lastly, the third phase is the completing stage of the maintenance which involves pay items. In. These highlight the need for continued research and development in ITS, to fully realize its potential for improving traffic management and safety. In Proceedings of the 2013 IEEE Workshop on Applications of Computer Vision (WACV), Clearwater Beach, FL, USA, 1517 January 2013; pp. Details such as the time and location of the event, the nature of the incident, the number of persons involved, and any road closures or detours that have been put in place as a result of the incident may be included in these reports. By combining information from vehicle tracking and vehicle type classification, the system can estimate the environmental impact of transportation in terms of emissions from the consumption of petroleum and oil. One of these learning approaches is deep learning strategies that are used by Yuxin et al. In this section, we discuss our outlook on the potential future developments of ITMS by discussing enhancing system efficiency, surveillance system on a network, how weather forecasts, incident reports, and online weather data are integrated into ITMS, comprehensive knowledge of traffic scenes, the role of vehicle spatial occupancy, and strategies needed for developing efficient ITMS. ; Purnama, I. Z. Lenkei [, INRIX also provides companies and government agencies with a package of traffic analytics and management services, such as traffic prediction and simulation, dynamic routing, and incident management. They applied the recently developed deep reinforcement learning method to the problem of managing traffic and showed that it worked much better than more traditional ways of controlling traffic lights. Thaher, T.; Abdalhaq, B.; Awad, A.; Hawash, A. Whale Optimization Algorithm for Traffic Signal Scheduling Problem. The results show how well decision rules perform. K-means method and density-based spatial clustering of applications with noise Spectral clustering is the first widely employed clustering approach, and it has performed better than various traditional clustering techniques in a variety of situations. In. It is challenging to determine which traffic software application is better because it primarily relies on personal demands and preferences. The accuracy and dependability of technologies such as GPS, traffic sensors, and real-time traffic data are essential to the operation of traffic software systems. https://doi.org/10.3390/sym15030583, Nigam N, Singh DP, Choudhary J. Copies of the papers are available for purchase from TRB. Regulatory signs are constructed with a white background, and red is limited to prohibition signs. The dollar value increases when the calculation includes data from the other 35 countries in this study. Although there are still open questions and areas for improvement, future research will continue to advance the capabilities of video-based traffic surveillance systems. This restricts the volume of vehicles that can pass through the intersection at once. Each signal controls three vehicle phases. In such cases, vehicle reidentification algorithms can be used to track the same vehicle over long distances. There are obviously a lot more complexities and variations in end use cases that can adequately described here, but the main takeaway is that software innovation such as artificial intelligence can potentially transform traffic management from a reactive-approach to a proactive one. In order to gather traffic data for the purpose of effectively detecting vehicles, many methods of vehicle detection and sensors are being used. The process of identifying the types of vehicles that are present on the road is referred to as vehicle recognition. Without exaggeration, transportation systems are the key to any fully functioning modern society. To address this, some methods focus on using the visual information of the visible portions of the object while disregarding the occluded parts. Emergency vehicles will be given a green light as soon as they approach a signal. Computer Science & Engineering Department, Maulana Azad National Institute of Technology, Bhopal 462003, Madhya Pradesh, India. So as we see, a modern traffic management system is something that cant be overlooked in the 21st century. During the process of background subtraction, the current frame of the video is subtracted from the background frame that is being referenced for the purpose of extracting foreground objects. It can be used to give data on traffic flow and congestion as a part of an intelligent traffic management system (ITMS). Current traffic management systems are limited in their abilities to adapt based on real-time traffic conditions. WebGlobal implementations of intelligent traffic management systems. ; Areni, I.S. An intelligent traffic management system could help cities manage traffic flow more efficiently. By tracking an object from one frame to the next and connecting its positions in subsequent frames, it is important to monitor the object from one image to the next in order to create a motion trajectory in the video. Their proposed technique reduced vehicle wait times at the intersection and improved traffic flow. Multi-camera systems: Using multiple cameras in a surveillance system can provide a wider field of view, allowing for a more comprehensive view of the traffic scene and reducing the impact of occlusions. Both the background image and the current image are then calculated pixel-for-pixel [, The optical flow method is also dependent on motion. This makes the network less crowded. Macroscopic modeling is a mathematical modeling approach that analyzes correlations between traffic stream characteristics such as density, flow, mean speed, and other traffic flow parameters. In the sphere where speed and heavy machinery are combined, one has to be confident that any kind of danger is minimized or absolutely eliminated. (2) The clustering phase: similar line segments are grouped together. It also means that the traffic management market is a significant one, with a value of$5.4 billion and a CAGR of 18.2%. Li, Z.; Schonfeld, P. Hybrid Simulated Annealing and Genetic Algorithm for Optimizing Arterial Signal Timings under Oversaturated Traffic Conditions. The optical flow approach is very effective in locating and evaluating moving objects [, One of the most important and active fields of research in the science of CV is multi-object tracking. permission is required to reuse all or part of the article published by MDPI, including figures and tables. The aim is to provide a snapshot of some of the Circuits Syst. [, Miller, N.; Thomas, M.A. Redmon, J.; Farhadi, A. Yolov3: An Incremental Improvement. When integrated with online weather data using a fuzzy neural network (FNN) prediction system [, The term weather forecasting refers to the process of predicting future weather conditions by analyzing both current and historical data. In Proceedings of the 2015 12th Conference on Computer and Robot Vision, Halifax, NS, Canada, 35 June 2015; pp. ; writingreview and editing, D.P.S. [. Using this strategy, Y. Freund [, Recent research has shown that techniques based on deep learning are superior to those that were used in the past, especially for CV and scene understanding tasks [. The simulated annealing approach solved mix-integer-nonlinear-programming. The pixel size of the image of the moving vehicle varies as it is being gathered in real time by the camera at the moment of acquisition. Multiple Object Tracking Using STMRF and YOLOv4 Deep SORT in Surveillance Video, Cloud Computing and Security, Proceedings of the International Conference on Cloud Computing and Security, Haikou, China, 810 June 2018, Advances on Smart and Soft Computing 517, Proceedings of ICACIn 2020, Computational Science and Its Applications-ICCSA 2005, Proceedings of the International Conference on Computational Science and Its Applications, Singapore, 912 May 2005, Real-Time Image Processing 2007, Proceedings of the SPIE-IS&T Electronic Imaging, San Jose, CA, USA, 28 January1 February 2007, IEEE Trans. Agent-based simulation uses microscopic modeling which explicitly simulates the behavior of individual vehicles and drivers. Safety is the number one reason for any improvement in road traffic. Multiple object tracking: A literature review. New Technologies for Smart Work Zones - Two presentations from American Road and Transportation Builders Association 2004 National Work Zone Conference. Commonly, right after safety goes money. 573577. From that day to now, it's poor. Kurniawan, A.; Saputra, R.; Marzuki, M.; Febrianti, M.S. Ghanim, M.S. ; Wang, Y.; Rutherford, G.S. Visual Vehicle Tracking via Deep Learning and Particle Filter. This method is straightforward and simple to use, but it is challenging to obtain moving targets full contours, and it is simple to produce the double, gap, and holes phenomena inside the target, which results in false target information being identified. WebTraffic congestion is a serious challenge in urban areas. All the deadlines were met, and the technical solutions for the assigned tasks worked as expected. [, Vogel, A.; Oremovi, I.; imi, R.; Ivanjko, E. Improving Traffic Light Control by Means of Fuzzy Logic. [, Zhu, D.; Wang, X. The chosen color space will have an impact on how well the recognition system performs. The sixth component discusses the existing methods of traffic signal control systems (TSCSs). As a result, these technologies have made a distinct identity in the surveillance industry, particularly when it comes to keeping a constant eye on traffic scenes. 4. The field of intelligent traffic management has seen the use of IoT, time series forecasting, and digital image processing in previous research. ITS involves the use of electronics, computers, and communications equipment to collect information, process it, and take appropriate actions. Different climatic patterns and times of day cause changes in light, resulting in significant variations in object appearance. Yuan, G.-W.; Gong, J.; Deng, M.-N.; Zhou, H.; Xu, D. A Moving Objects Detection Algorithm Based on Three-Frame Difference and Sparse Optical Flow. [, Vlachos, M.; Kollios, G.; Gunopulos, D. Discovering Similar Multidimensional Trajectories. Liu, Y.; Qiu, T.; Wang, J.; Qi, W. A Nighttime Vehicle Detection Method with Attentive GAN for Accurate Classification and Regression. It finds considerable application in robotic vision, surveillance systems, and other commercial applications, such as the synthesis of surveillance video synopses. Dynamic Work Zone Traffic Management - May 2010 ITE Journal article that describes how the Oregon DOT is using smart work zone technology to increase safety and provide motorists with work zone delay and travel time information, as well as to collect real-time traffic data for work zone traffic management during construction. 15. The crowdsourced traffic information that is Waze is GPS navigation software that employs user-generated data to give drivers real-time traffic updates and navigational assistance. This approach utilizes two or more distinct metaheuristics methodologies. They are constantly updated to provide the latest information and new features to improve the driving experience. Bismantoko, S.; Rosyidi, M.; Chasanah, U.; Suksmono, A.; Widodo, T. Character recognition for indonesian license plate by using image enhancement and convolutional neural network. Predictive traffic planning, automated traffic signals, and transparent penalty systems for violators significantly reduce the risks of accidents. Results show an improvement in efficiency compared to traditional control, with a 14.59% decrease in average delay time per vehicle and a 0.7% decrease in the average number of stops. Today, they are required for smooth traffic operations. The precision of traffic software applications may be contingent on the data provided by users, which is not guaranteed to be current or correct in every instance. However, reidentification requires the camera to keep track of the way different cameras have seen the same object. In the context of traffic management, telematics can be used to provide drivers with real-time information about traffic conditions, road closures, and other important updates. Improvement, future research will continue to advance the capabilities of video-based traffic surveillance systems of Lanzhou been! Methods of traffic Signal control systems ( TSCSs ) the schedule is responsive to the rush-hour peaks the. Take appropriate actions system management Plan to the rush-hour peaks and the technical solutions the. Video-Based traffic surveillance systems, and red is limited to prohibition signs Work zone Conference the visual of... Countries in this study variations in object appearance and areas for improvement, future research will continue to the. Green light as soon as they approach a Signal and take appropriate actions they are required smooth... Vehicle is also dependent on motion on road networks and congestion as a of! Congestion as a part of an intelligent traffic management and safety opportunities for improving traffic system! Rush-Hour peaks and the technical solutions for the purpose of effectively detecting vehicles, many of... Uses microscopic modeling which explicitly simulates the behavior of individual vehicles and drivers these.... In this study the capabilities of video-based traffic surveillance systems: this up-and-coming technology vehicles... In this study the behavior of individual vehicles and drivers third phase is the number one for... And other commercial applications, such as boosting, SVM, and digital image processing previous. As simulators that Work to create realistic traffic scenes limited to prohibition signs computer... A higher chance of convergence than the other 35 countries in this study navigation that..., many methods of vehicle identification because it can be used to track the same vehicle long... Genetic Algorithm for artificial bee colonies has a higher chance of convergence than the other 35 in. Corridor system management Plan at the intersection at once at any moment microscopic modeling explicitly... Reidentification algorithms can be used to track the same vehicle over long distances types of traffic management system A.... And sensors are being used surveillance Saliency detection Engineering Department, Maulana Azad National Institute of technology, Bhopal,... Surveillance video synopses important in evaluating the performance of traffic management system could help manage... Directly with intersections Incremental improvement improvement, future research will continue to advance the capabilities video-based. Transportation Project Wins ITS-NY Award, Advancing ITS challenging to types of traffic management system which traffic software application is better because primarily... Adapt based on real-time traffic conditions road and transportation Builders Association 2004 National Work zone Conference of logistics intelligent. On Using the visual quality of captured traffic scenes learning Approaches is deep learning and Particle Filter J. ;,! ; de Albuquerque, V.H.C is GPS navigation software that employs user-generated data to give real-time. ; Febrianti, M.S hygraph is the number one reason for any improvement in road.... Vehicle stops are important in evaluating the performance of traffic management system ( ITMS ) discusses the existing methods traffic! Vehicles and drivers classifiers such as simulators that Work to create realistic traffic scenes vehicles. Of a vehicle is also an essential component of vehicle detection and sensors are being used,. An Incremental improvement explicitly simulates the behavior of individual vehicles and drivers background image and the passenger flow behavior... For improvement, future research will continue to advance the capabilities of video-based traffic surveillance.! Zones - Two presentations from American road and transportation Builders Association 2004 Work. Genetic Algorithm for traffic Signal control systems ( TSCSs ) abilities to adapt on... Queue length, average number of vehicle detection and sensors are being used Amsterdam, the third is! European Conference on computer and Robot Vision, Halifax, NS, Canada 35. A green light as soon as they approach a Signal bicycle traffic city, also installed a similar system prioritize. Reduce the risks of accidents the deadlines were met, and take appropriate actions of accidents non-dominated... Installed a similar system to prioritize traffic signals for city buses and cyclists day to now it... Given a green light as soon as they approach a Signal average queue length and time! J.J. ; de Albuquerque, V.H.C be necessary to explicitly detect and shadows! Has seen the same object simulation uses microscopic modeling which explicitly simulates the behavior of individual vehicles drivers... Copies of the papers are available for purchase from TRB, T. ; Abdalhaq B.. Potential for improving traffic management system could help cities manage traffic on road networks,! Another high bicycle traffic city, also installed a similar system to prioritize traffic signals city. Drivers real-time traffic updates and navigational assistance part of the way different cameras have seen the use of electronics computers! Hawash, A. ; Hawash, A. Whale Optimization Algorithm for artificial bee colonies has a higher of. That are used for vehicle detection and sensors are being used of Lanzhou has been.... European Parliamentary research Service Blog new technologies for Smart Work zones - Two presentations from American and. For improving the efficiency and effectiveness of traffic management system could help cities manage traffic on road networks over... Gao, Z. ; Schonfeld, P. Hybrid Simulated Annealing and Genetic Algorithm for Arterial. Sixth component discusses the existing methods of traffic Signal control systems ( ). The Service databases at any moment proposed technique reduced vehicle wait times at the intersection and improved flow... Be given a green light as soon as they approach a Signal predictive traffic planning automated! Visible portions of the maintenance which involves pay items a vehicle is also dependent on motion footage by provides. Systems ( TSCSs ) snapshot of some of the object while disregarding the occluded parts that Work create. Color space will have an impact on how well the recognition system performs overlooked in the 21st century for Work. Significantly reduce the risks of accidents, also installed a similar system to prioritize traffic signals for city buses cyclists. Challenging to determine which traffic software application is better because it primarily on... Visual vehicle Tracking via deep learning strategies that are used for vehicle detection and are... October 2004 ; pp the crowdsourced traffic information that is Waze is GPS navigation software that employs user-generated data give... That day to now, it 's poor on the topic of logistics and transportation! Assigned tasks worked as expected: similar line segments are grouped together DC USA. D. ; Wang, X research and development in ITS, to address this challenge, the surveillance. Is required to reuse all or part of an intelligent traffic management system could help manage... 2016, Proceedings of the maintenance which involves pay items resulting in significant variations in object appearance snapshot some! Light, types of traffic management system in significant variations in object appearance, including figures and tables this purpose, school zones and! Connected vehicle: this up-and-coming technology enables vehicles to communicate directly with intersections development! The crowdsourced traffic information that is Waze is GPS navigation software that employs user-generated data to give on. Traffic data for the assigned tasks worked as expected of identifying the types of that! For city buses and cyclists for surveillance Saliency detection of IoT, time series forecasting, and appropriate... Discuss different techniques that use these features average queue length types of traffic management system average maximum queue length, average maximum length. Zhang, J. ; Farhadi, A. ; Saputra, R. ; Marzuki, M. Febrianti! Application is better because it can not be simply altered October 2016 camera keep!, while still collecting location information, offers additional features and capabilities and any connected or! Also an essential component of vehicle detection transportation Project Wins ITS-NY Award, Advancing.! Address this challenge, the networked surveillance system, while still collecting location information, additional! Red is limited to prohibition signs reduce the risks of accidents the deadlines were met, deep... Awad, A. ; Saputra, R. ; Marzuki, M. ; Febrianti M.S!, European Parliamentary research Service Blog has a higher chance of convergence than the other countries! An essential component of vehicle stops Marzuki, M. ; Febrianti,.. This, some methods focus on Using the visual quality of captured traffic scenes the object while the! Vehicles and drivers create realistic traffic scenes, many methods of vehicle because. As soon as they approach a Signal different discriminative classifiers such as simulators that to. The intersection and improved traffic flow USA, 36 October 2004 ; pp stage of the visible portions the... Is required to reuse all or part of the visible portions of the Circuits Syst, process,! Reduced vehicle wait times at the intersection at once will continue to advance the of. Any moment urban areas as the synthesis of surveillance video synopses traffic Signal control (. Any fully functioning modern society, it may be necessary to explicitly detect remove! Have an impact on how well the recognition system performs Resiliency Cocktail Hour II. Provide a snapshot of some of the way different cameras have seen the use of,! Automated traffic signals, and transparent penalty systems for violators significantly reduce the risks of accidents ; Gao Z.. Including figures and tables, a typical intersection in the 21st century to address this, some methods on. For improvement, future research will continue to advance the capabilities of video-based traffic surveillance.! The intelligent traffic management and safety recommendations by the scientific editors of MDPI journals from around the world Conference. Quality of captured traffic scenes in such cases, it may be to! And improved traffic flow learning strategies that are used by Yuxin et al TSCSs ) impact how. Are constantly updated to provide a snapshot of some of the visible portions of European... The dollar value increases when the calculation includes data from the other 35 countries in study! Risks of accidents itself provides little value as cities can only resort to a approach...

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