scholarly journals Intelligent Advisory Speed Limit Dedication in Highway Using VANET

2014 ◽  
Vol 2014 ◽  
pp. 1-20 ◽  
Author(s):  
Ali Jalooli ◽  
Erfan Shaghaghi ◽  
Mohammad Reza Jabbarpour ◽  
Rafidah Md Noor ◽  
Hwasoo Yeo ◽  
...  
Keyword(s):  
Traffic Flow ◽  
Traffic Safety ◽  
Control Strategy ◽  
Ad Hoc ◽  
Road Traffic ◽  
Weather Conditions ◽  
Speed Limit ◽  
Road Traffic Safety ◽  
Simulation Results ◽  
Advisory Speed

Variable speed limits (VSLs) as a mean for enhancing road traffic safety are studied for decades to modify the speed limit based on the prevailing road circumstances. In this study the pros and cons of VSL systems and their effects on traffic controlling efficiency are summarized. Despite the potential effectiveness of utilizing VSLs, we have witnessed that the effectiveness of this system is impacted by factors such as VSL control strategy used and the level of driver compliance. Hence, the proposed approach called Intelligent Advisory Speed Limit Dedication (IASLD) as the novel VSL control strategy which considers the driver compliance aims to improve the traffic flow and occupancy of vehicles in addition to amelioration of vehicle’s travel times. The IASLD provides the advisory speed limit for each vehicle exclusively based on the vehicle’s characteristics including the vehicle type, size, and safety capabilities as well as traffic and weather conditions. The proposed approach takes advantage of vehicular ad hoc network (VANET) to accelerate its performance, in the way that simulation results demonstrate the reduction of incident detection time up to 31.2% in comparison with traditional VSL strategy. The simulation results similarly indicate the improvement of traffic flow efficiency, occupancy, and travel time in different conditions.

scholarly journals Measures to ensure road traffic safety on controlled intersections

2019 ◽  
Vol 298 ◽  
pp. 00046 ◽  
Author(s):  
Aleksandr Novikov ◽  
Ivan Novikov ◽  
Anastasiya Shevtsova
Keyword(s):  
Traffic Flow ◽  
Traffic Safety ◽  
Road Traffic ◽  
Weather Conditions ◽  
Transport Systems ◽  
Light Cycle ◽  
Traffic Light ◽  
Intelligent Transport ◽  
Road Traffic Safety ◽  
Rational Distribution

The paper discusses a new approach to ensuring the safety of controlled intersections. In the course of research, the authors found a change in the main characteristics of the traffic flow, which requires constant monitoring in the implementation of the intersection control using a traffic light. The heterogeneity of the composition of the traffic flow is determined and the influence of this parameter on the duration of the resolving signal is established. In addition, the authors determined the influence of weather conditions on the duration of the traffic light cycle and developed an approach to take into account changes in this factor in the calculation of the mode of operation of the traffic light object. As a result of the model experiment, the economic and environmental efficiency of the developed approach is determined. The results obtained in the course of the study are an integral part in the implementation of intelligent transport systems, which confirms the relevance and feasibility of the study. The use of this approach, in addition to integration into the its system, allows to reduce the accident rate of controlled intersections due to the rational distribution of the time of the traffic light object and reduce vehicle delays on the approaches, which together ensures the safety of regulated areas.

A Geocast Protocol with Information-Centric Perspective in Vehicular Ad-Hoc Networks (VANETs)

2018 ◽  
Vol 7 (2) ◽  
pp. 1-18
Author(s):  
Houacine Abdelkrim ◽  
Guezouri Mustapha
Keyword(s):  
Ad Hoc Networks ◽  
Routing Protocol ◽  
Traffic Safety ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Road Traffic ◽  
High Mobility ◽  
Road Traffic Safety ◽  
Hoc Networks

Vehicular ad-hoc networks (VANETs) is subclass of network of mobile ad-hoc network (MANET) type, it has emerged as a platform that supports inter-vehicles communication to improve road traffic safety. A conventional packet-based routing protocol where a packet moves from a source to a destination untouched throughout the entire process no longer satisfies the requirements in VANETs because of the high mobility of vehicles. This article proposes a routing protocol with an information-centric perspective for the VANETs, the techniques invoked are: Geocast instead of the classical multicast and the aggregation location-based. The simulation results under NS-3 and SUMO show that this protocol can help to limit the redundancy of the messages exchanged by their aggregation without maintaining a hierarchical structure; which minimizes transmission costs and ensures reliability and performance.

scholarly journals Equipment Condition for Zebra Crossing Night-Time Safety Performance in Latvia

2021 ◽  
Vol 16 (4) ◽  
pp. 108-125
Author(s):  
Maris Seflers ◽  
Juris Kreicbergs ◽  
Gernot Sauter
Keyword(s):  
Traffic Safety ◽  
Urban Areas ◽  
Road Traffic ◽  
Weather Conditions ◽  
Technical Equipment ◽  
Night Time ◽  
Traffic Signs ◽  
Road Traffic Safety ◽  
Road Sign ◽  
Road Marking

According to road traffic accident (hereinafter referred to as RTA) statistics, the vulnerable road users are pedestrians in Latvia. The aim of this study is to investigate and analyse technical equipment used on non-signalled pedestrian crossings (zebra crossings) in Latvia and to make suggestions for measures that would increase road traffic safety on zebra crossings. RTAs involving collisions with pedestrians were filtered from the Ministry of the Interior database for a three-year period from 2016 to 2018. Thirty-two zebra crossings with a higher number of accidents with pedestrians were observed on the spot during the daylight and at night in several cities of Latvia. The main emphasis during the observation was placed on traffic signs and zebra road marking performance. Pedestrian crossings were observed from car driver’s view by taking photographs during day-time and night-time observations. Most attention was paid to road sign and road marking visibility from driver’s seat position. Retroreflection coefficient R’ was measured for each pedestrian crossing road sign. It was found that the condition and performance of traffic organisation equipment were not maintained on a regular basis and the life cycle of some traffic signs had well expired. Many road signs do not comply with minimum requirements, and road markings have weak visibility during wet weather conditions. It is recommended to improve visibility of pedestrian crossings from driver’s view in the urban areas by increasing rain vision for road markings and higher retroreflection class for traffic signs.

Theoretical Calculation of the Maximum Speed Limit Value on Freeway in Adverse Weather

2012 ◽  
Vol 209-211 ◽  
pp. 663-666
Author(s):  
Yu Feng Guo ◽  
Guo Zhu Cheng
Keyword(s):  
Theoretical Calculation ◽  
Traffic Safety ◽  
Road Traffic ◽  
Driving Safety ◽  
Maximum Speed ◽  
Speed Limit ◽  
Safety Level ◽  
Road Traffic Safety ◽  
Limit Value ◽  
Adverse Weather

In order to increase driving safety level on freeway, the paper analyzed the affecting mechanism of rainy day, snowy day and foggy day on road traffic safety. Considering that the sum of running distance and braking distance is less than visible distance, theoretical calculation formula of maximum speed limit value on freeway in adverse weather was presented based on the safe distance. Suggestions values of corresponding speed limit were given according to different visible distance, road fiction coefficient and grade.

scholarly journals Impact of routing protocol on performance of wireless ad hoc vehicular network

2012 ◽  
pp. 220-227
Author(s):  
v. p. patil ◽  
b. p. saoji
Keyword(s):  
Routing Protocol ◽  
Traffic Safety ◽  
Ad Hoc Network ◽  
Wireless Lan ◽  
Ad Hoc ◽  
Road Traffic ◽  
Vehicular Network ◽  
Hybrid Network ◽  
Road Traffic Safety ◽  
The Impact

Vehicular Ad Hoc Network (VANET) is an emerging new technology integrating ad hoc network, wireless LAN (WLAN) and cellular technology to achieve intelligent inter-vehicle communications and improve road traffic safety and efficiency. VANETs are distinguished from other kinds of ad hoc networks by their hybrid network architectures, node movement characteristics, and new application scenarios. Therefore, VANETs pose many unique networking research challenges, and the design of an efficient routing protocol for VANETs is very crucial. In this paper, we discuss the impact of routing protocol on performance of wireless ad hoc vehicular network along with recent routing protocols. Ad hoc network characteristics are explained in brief. We propose a routing framework based on the enhanced cooperation between the medium access layer and network layers. An algorithm is discussed which takes onto account position, direction and speed of vehicles .Then this concept is applied to reactive routing protocol and introduced preliminary simulation results using ns-2.It is observed that network performance gets improved .

Road Traffic Safety Assessment Based on the ADAMS/Car under Snow and Freezing Weather

2012 ◽  
Vol 226-228 ◽  
pp. 2366-2369
Author(s):  
Tie Qiang Li ◽  
Rong Guo Ma ◽  
Fang Chao Wu ◽  
Ya Juan Deng
Keyword(s):  
Traffic Safety ◽  
Road Traffic ◽  
Lateral Displacement ◽  
Weather Conditions ◽  
Coupling Model ◽  
Steering Angle ◽  
Safety Level ◽  
Road Traffic Safety ◽  
Road Friction ◽  
The Difference

In order to assess the traffic safety in snow and freezing weather accurately, determined the difference of vehicle lateral displacement of snow freezing and normal weather conditionsthe as the indicator, vehicle model, road model and vehicle-road coupling model were set up by using software ADAMS/Car. By changing road friction cofficient, road conditions in snow and freezing weather were simulated, step steering were carried out, vehicle lateral displacement of different speed and steering angle were obtained, the difference of vehicle lateral displacement of different speed and steering angle under snow and freezing weather and normal weather conditions were calculated, then the curve of difference of vehicle lateral displacement were generated, traffic safety level division of road under snow and freezing weather were researched based on these curves.

scholarly journals The use of simulator studies to assess the impact of ITS services on road users behaviour

2018 ◽  
Vol 231 ◽  
pp. 02009 ◽  
Author(s):  
Małgorzata Pędzierska ◽  
Tomasz Kamiński
Keyword(s):  
Traffic Safety ◽  
Driving Simulator ◽  
Road Traffic ◽  
Age Groups ◽  
Weather Conditions ◽  
The Road ◽  
Traffic Efficiency ◽  
Road Traffic Safety ◽  
On The Road ◽  
The Impact

The subject of this publication is the use of top-of-the-range driving simulators to study the impact of ITS services on the road safety. The aim of the article is to describe the assumptions of simulation studies carried out as part of the RID 4D project and to present the method of building research scenarios. The article discusses the catalogue of ITS services of the greatest importance to the Road Traffic Safety and traffic efficiency developed under the project. Then, services from the catalogue were specified, which were tested on the driving simulator of the Motor Transport Institute. The tests included sections of a dual-lane expressway. As a result of the work, four scenarios were created containing various dangerous events and variable message boards informing drivers about the danger and/or limiting the permitted speed. During the simulation, a set of several dozen parameters related to vehicle motion was recorded, in particular the distance to the vehicle ahead, time to collision with another vehicle or object on the road, speed, intensity of braking and acceleration. The tests were performed for good and bad weather conditions on a 60-person study group. The division into age groups 18-24, 25-50 and above 50 years was applied. The research showed a difference in the way drivers of static signs and speed limits on the variable message signs affect drivers. For variable messages signs, there was a greater decrease in speed than in the case of static signs.

Analysis of exceedings the speed limit in Poland

2018 ◽  
Vol 120 ◽  
pp. 253-264
Author(s):  
Elżbieta Macioszek ◽  
Damian Lach
Keyword(s):  
Traffic Safety ◽  
Traffic Accident ◽  
Road Traffic ◽  
Speed Limit ◽  
Basic Tool ◽  
Factors Affecting ◽  
Road Traffic Safety ◽  
Speed Management ◽  
Main Factors

Driving with excessive speed is considered as one of the main factors affecting traffic safety. This factor affects not only to the risk associated with the participation in a traffic accident, but also on the consequences of these accidents. The paper presents the analysis of the number of exceeding the speed limit in Poland. The analysis was based on data obtained from the Center of Automatic Supervision of Road Traffic. Of all Polish voivodships, the highest number of exceeding the speed limit was disclosed in the Mazowieckie and Śląskie Voivodships. Furthermore, in all voivodeships, the highest number of exceeding the speed limit was recorded in the range of 11-30 km/h. The smallest drivers group is exceeding the speed limit over 50 km/h. A positive phenomenon is the fact that as the speed increases, the number of vehicle drivers exceeding the speed limit is decreases. The presented data confirms that the basic tool used to improve road traffic safety is proper speed management and supervision.

Safety Enhancement by Automated Driving: What are the Relevant Scenarios?

2020 ◽  
Vol 64 (1) ◽  
pp. 1686-1690
Author(s):  
Niklas Grabbe ◽  
Michael Höcher ◽  
Alexander Thanos ◽  
Klaus Bengler
Keyword(s):  
Traffic Safety ◽  
Road Traffic ◽  
Test Cases ◽  
Automated Driving ◽  
Road Traffic Safety ◽  
Human Driver ◽  
Driving Task ◽  
Promising Solution ◽  
Vehicle Automation ◽  
Safety Enhancement

Automated driving offers great possibilities in traffic safety advancement. However, evidence of safety cannot be provided by current validation methods. One promising solution to overcome the approval trap (Winner, 2015) could be the scenario-based approach. Unfortunately, this approach still results in a huge number of test cases. One possible way out is to show the current, incorrect path in the argumentation and strategy of vehicle automation, and focus on the systemic mechanisms of road traffic safety. This paper therefore argues the case for defining relevant scenarios and analysing them systemically in order to ultimately reduce the test cases. The relevant scenarios are based on the strengths and weaknesses, in terms of the driving task, for both the human driver and automation. Finally, scenarios as criteria for exclusion are being proposed in order to systemically assess the contribution of the human driver and automation to road safety.

scholarly journals Assessing inequality, irregularity, and severity regarding road traffic safety during COVID-19

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lei Lin ◽  
Feng Shi ◽  
Weizi Li
Keyword(s):  
New York ◽  
Los Angeles ◽  
Traffic Safety ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Human Mobility ◽  
Critical Conditions ◽  
Road Traffic Safety ◽  
Accident Data ◽  
The Impact

AbstractCOVID-19 has affected every sector of our society, among which human mobility is taking a dramatic change due to quarantine and social distancing. We investigate the impact of the pandemic and subsequent mobility changes on road traffic safety. Using traffic accident data from the city of Los Angeles and New York City, we find that the impact is not merely a blunt reduction in traffic and accidents; rather, (1) the proportion of accidents unexpectedly increases for “Hispanic” and “Male” groups; (2) the “hot spots” of accidents have shifted in both time and space and are likely moved from higher-income areas (e.g., Hollywood and Lower Manhattan) to lower-income areas (e.g., southern LA and southern Brooklyn); (3) the severity level of accidents decreases with the number of accidents regardless of transportation modes. Understanding those variations of traffic accidents not only sheds a light on the heterogeneous impact of COVID-19 across demographic and geographic factors, but also helps policymakers and planners design more effective safety policies and interventions during critical conditions such as the pandemic.

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