Modeling and analyzing traffic safety perceptions: An application to the speed limit reduction pilot project in Edmonton, Alberta

2013 ◽  
Vol 51 ◽  
pp. 156-167 ◽  
Author(s):  
Karim El-Basyouny ◽  
Mohamed Yahia El-Bassiouni
Keyword(s):  
Traffic Safety ◽  
Pilot Project ◽  
Speed Limit ◽  
Safety Perceptions

scholarly journals The Effects of ITS Application in Speed Management on State Road From Mali Pozarevac to Kragujevac

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Tomislav Petrović ◽  
Miloš Milosavljević ◽  
Milan Božović ◽  
Danislav Drašković ◽  
Milija Radović
Keyword(s):  
Traffic Safety ◽  
Traffic Management ◽  
Quality Data ◽  
Transport Systems ◽  
Speed Limit ◽  
Accident Risk ◽  
The Road ◽  
Road Users ◽  
Speed Management ◽  
On The Road

The application of intelligent transport systems (hereinafter ITSs) on roads enables continuous monitoring of road users during a whole year with the aim to collect good-quality data based on which the more complex analyses could be done, such as monitoring of certain traffic safety indicators. Automatic traffic counters are one of the most commonly implemented ITSs for collecting traffic flow parameters that are relevant for traffic management on state roads in Republic of Serbia. This paper presents one of the possible ways to collect, analyze and present data on road users’ speeds using automatic traffic counters, where certain traffic safety indicators are analyzed in terms of road users’ compliance with the speed limit on the road section from Mali Pozarevac to Kragujevac. Based on the analyses of data downloaded from automatic traffic counters, it is observed that an extremely high percentage of vehicles drive at speed higher than the speed limit, indicating clearly to higher traffic accident risk, as well as to the need for a tendency to implement speed management on roads using ITS in the forthcoming period.

scholarly journals Improved Road Safety at Work Zones using Advanced Traveler Information Systems

2020 ◽  
Author(s):  
Mustafa Suhail Almallah ◽  
Qinaat Hussain ◽  
Wael K. M Alhajyaseen ◽  
Tom Brijs
Keyword(s):  
Traffic Safety ◽  
Driving Simulator ◽  
Work Zone ◽  
Speed Limit ◽  
Work Zones ◽  
Treatment Scenario ◽  
Lane Changing ◽  
Variable Message Signs ◽  
Study Results ◽  
Message Signs

Work zones are road sections where road construction or maintenance activities take place. These work zones usually have different alignment and furniture than the original road and thus temporary lower speeds are adopted at these locations. However, drivers usually face difficulty in adopting the new speed limit and maneuvering safely due to the change in alignment. Therefore, work zones are commonly considered as hazardous locations with higher crash rates and severities as reported in the literature. This study aims to investigate the effectiveness of a variable message signs (VMSs) based system for work zone advance warning area. The proposed system aims at enhancing driver adaptation of the reduced speed limit, encourage early lane changing maneuvers and improve the cooperative driving behavior in the pre-work zone road section. The study was conducted using a driving simulator at the College of Engineering of Qatar University. Seventy volunteers holding a valid Qatari passenger car driving license participated in this study. In the simulator experiment, we have two scenarios (control and treatment). The control scenario was designed based on the Qatar Work Zone Traffic Management Guide (QWZTMG), where the length of the advance warning area is 1000 m. Meanwhile, the treatment scenario contains six newly designed variable message signs where two of them were animation-based. The VMSs were placed at the same locations of the static signs in the control scenario. Both scenarios were tested for two situations. In the first situation, the participants were asked to drive on the left lane while in the second situation, they were instructed to drive on the second lane. The study results showed that the proposed system was effective in motivating drivers to reduce their traveling speed in advance. Compared to the control scenario, drivers’ mean speed was significantly 6.3 and 11.1 kph lower in the VMS scenario in the first and second situations, respectively. Furthermore, the VMS scenario encouraged early lane changing maneuvers. In the VMS scenario, drivers changed their lanes in advance by 150 m compared to the control scenario. In addition, the proposed system was effective in motivating drivers to keep larger headways with the frontal merging vehicle. Taking into account the results from this study, we recommend the proposed VMS based system as a potentially effective treatment to improve traffic safety at work zones.

scholarly journals Determination of Curve Speed Zones for Mountainous Freeways

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Yongtao Liu ◽  
Jie Qiao ◽  
Yanting Hu ◽  
Tengyuan Fang ◽  
Ting Xu ◽  
...  
Keyword(s):  
Traffic Safety ◽  
Warning Signs ◽  
Driving Safety ◽  
Warning Sign ◽  
Speed Limit ◽  
Vehicle Speed ◽  
Estimation Model ◽  
Traffic Efficiency ◽  
Safety Warning ◽  
The Difference

Different vehicular speed limits may have an impact on the balance between safety and efficiency of travel on mountainous road corners associated with complex road conditions. Placing suitable speed limit warning signs does not merely effectively improve traffic safety but can also improve traffic efficiency. In this study, a global positioning system (GPS) terminal and Metrocount were used to collect vehicle speed data from more than 40 provincial-level curves in 8 provinces over the course of 1 year. Each road data collection time-period lasted approximately 8 hours. A descriptive statistics method was adopted by means of data screening and pretreatment. Additionally, both a velocity difference estimation model was established and a linear model of velocity differential estimation was constructed. Quantitative analysis was carried out on the safe speed, the driver’s expected speed, and the location of the speed limit warning signs. This demonstrated a positive correlation with the initial speed. When the difference in speed was greater than 15 km/h, a safety warning sign was required to limit the design speed to 80 km/h. A safety warning sign was also required when the corner radius was less than 300 m. The location of safety warning signs could be calculated based on the operating speed and taking driving safety and the visual range of drivers into consideration. The results can provide a theoretical reference for setting up appropriate safe speed limiting signs on road corners in mountainous areas.

scholarly journals Exploring the influence of traffic enforcement on speeding behavior on low-speed limit roads

2019 ◽  
Vol 11 (12) ◽  
pp. 168781401989157
Author(s):  
Dan Zhao ◽  
Fengchun Han ◽  
Meng Meng ◽  
Jun Ma ◽  
Quantao Yang
Keyword(s):  
Traffic Safety ◽  
Stated Preference ◽  
Personal Characteristics ◽  
Speed Limit ◽  
Survey Analysis ◽  
Traffic Enforcement ◽  
Stated Preference Survey ◽  
Average Speed ◽  
Low Speed ◽  
The Impact

Speeding on low-speed limit roads is a common traffic offense in China, which could be due to the mild traffic safety enforcement. The article aims to explicit the impact of traffic enforcement measures on the speeding behavior on low-speed limit roads. First, field data were collected to demonstrate the severity of speeding by investigating speed distribution; second, a virtual traffic enforcement was designed by considering three factors related to traffic enforcement, and a stated preference survey questionnaire including six scenarios was designed and implemented; finally, a series of generalized regret random minimization models were established to study the relationship of speeding behavior and traffic enforcement as well as drivers’ personal characteristics. From the stated preference survey analysis, the research figures out that other vehicles’ average speed is the most important reference to choose speed rather than traffic penalties, and the model estimation results show that speeding violation grows severe if traffic enforcements are lenient. Therefore, increasing the violation costs is a powerful means of lowering the probability of speeding for individual, thus proceeding the drop of vehicles’ average speed, and the fall of average speed will contribute to decrease speeding subsequently.

Study on the Highway Speed Limit at the Days of Snow and Ice

2012 ◽  
Vol 226-228 ◽  
pp. 2362-2365
Author(s):  
Jun De Liu ◽  
Tian Tian Peng ◽  
Jing Zhuang ◽  
Ya Juan Deng
Keyword(s):  
Traffic Safety ◽  
Traffic Accidents ◽  
Speed Limit ◽  
Practical Application ◽  
Highway Traffic ◽  
The Road ◽  
Ice Conditions ◽  
On The Road ◽  
Rate Limiting ◽  
Snow And Ice

In order to prevent traffic accidents caused by bad speed snow day weather and achieve the purpose of protection of highway traffic safety. Through the analysis of ice conditions, we identified of the rate-limiting model in the snow, snow, snow icing conditions and curve sections, we applied to the model and the calculation of mathematical solution and come to the conclusion of the speed limit which is recommended values at the days of snow and ice disaster conditions. In the practical application, it is convenient to get the speed limit under the necessary conditions through look-up the table of this article in order to ensure the safety of traffic on the road.

Study on Driver’s Safety Sense Rule Based on Perception Speed at Daytime and Night

2012 ◽  
Vol 461 ◽  
pp. 128-131
Author(s):  
Li Xin Wu ◽  
Guo Zhu Cheng
Keyword(s):  
Field Experiment ◽  
Traffic Safety ◽  
Speed Limit ◽  
Rule Based ◽  
Driving Speed ◽  
Four Levels ◽  
Highway Alignment

In order to ensure traffic safety on freeway, speed limit is necessary. Driver’s safety sense to different speed is not same, so it should be considered by speed limit standard. Through field experiment, the data of driver’s perception speed at daytime and night were obtained. The data at daytime and night were compared. The deviations of perception speed were analyzed under different conditions of driving speed and highway alignment at daytime and night. Driver’s safety senses were classified as four levels of very safe, safe, dangerous and very dangerous. The relation between driver’s safety sense level and perception speed was analyzed. It shows that driver’s perception speed corresponding different safety sense level at daytime and night are also different.

Measuring Neighborhood Traffic Safety Benefits by Using Real-Time Driver Feedback Technology

2005 ◽  
Vol 1922 (1) ◽  
pp. 44-51
Author(s):  
Kevin N. Chang ◽  
Matthew Nolan ◽  
Nancy L. Nihan
Keyword(s):  
Traffic Safety ◽  
Response Times ◽  
Travel Speed ◽  
Speed Limit ◽  
Department Of Transportation ◽  
Safety Measures ◽  
Black And White ◽  
Roadway Safety ◽  
Driver Feedback ◽  
Additional Safety

Local jurisdictions frequently respond to public concerns about speeding on neighborhood streets. When a speed study confirms that a significant percentage of vehicles are exceeding the posted speed limit, a traffic engineer carefully reviews the conditions to determine if additional safety measures need to be implemented. Preserving roadway safety for the motorized and the nonmotorized public alike who share the roadway is essential. Each jurisdiction is likely to use any number of solutions from its traffic safety toolbox. Additional signing, mobile radar speed display units, neighborhood speed watch programs, or targeted police enforcement may help discourage drivers from traveling at unacceptable speeds. Physical devices, such as traffic circles, speed humps, and chicanes, can also be considered but will affect emergency vehicles by increasing their response times. To balance increased driver awareness of travel speeds with vehicle accessibility, the King County Department of Transportation in Washington State installed four radar speed signs along 108th Avenue NE between NE 124th Street and Juanita-Woodinville Way NE. These radar speed signs, installed directly below the black-and-white regulatory speed limit signs, alerted each driver by indicating travel speed. To evaluate the effectiveness of these signs, speed studies were conducted before, during, and after installation. The results from these studies are presented, installation and maintenance of this device are discussed, and conclusions are drawn about whether these signs have been successful in calming neighborhood traffic.

scholarly journals Evaluating the Safety Impacts of Increased Speed Limits on Freeways in Kansas Using Before-And-After Study Approach

2018 ◽  
Vol 11 (1) ◽  
pp. 119 ◽  
Author(s):  
Reza Shirazinejad ◽  
Sunanda Dissanayake ◽  
Ahmed Al-Bayati ◽  
David York
Keyword(s):  
Traffic Safety ◽  
Economic Benefits ◽  
Group Method ◽  
Speed Limit ◽  
Speed Limits ◽  
Study Approach ◽  
Highway Safety Manual ◽  
Before And After ◽  
Crash Modification Factors ◽  
Before And After Study

In the summer of 2011, a change in the Kansas laws came into effect, increasing the speed limit on a selected set of freeway sections from 70 mph to 75 mph. Higher speeds were thought to have economic benefits, mostly because the travel time reduction means people reach their destinations more quickly. In this study, the sections where the speed limits remained unchanged, are compared to freeway sections that have been influenced by speed limit increase, to evaluate safety effectiveness. The study utilizes the before-and-after study with comparison group method to assess the safety effects provided in the Highway Safety Manual (HSM). Two crash datasets, obtained by considering three years before and three years after the speed limit increase, were compared in order to evaluate the safety effects of the speed limit change. The crash modification factors (CMFs) were estimated, which showed that there was a 27% increase in total crashes and a 35% increase in fatal and injury crashes across all sections after the speed limit change, and these increases were statistically significant at 95% confidence level. These confounding results show that the speed limit increase has not been beneficial for traffic safety in Kansas, and hence it is important to be cautious in such future situations. Also, additional data have been presented which would be beneficial in identifying and understanding any behavior change in drivers following a speed limit increase.

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