Abstract
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.
Highlights
Curved road sections are a basic part of all highways. ese driving environments involve sudden changes in curved road sections, making it difficult for drivers to safely reduce the speed of their vehicles. ere are typically no clear speed limit signs on curved road sections with different curvature radii which lead to a higher accident rate
An important measure used to improve the safety of curved road sections is to use appropriate speed limits to control vehicle speed. e purpose of speed restriction is to balance traffic mobility, risk, driving time, and appropriate roadside levels associated with mountainous expressways
Research on safe speeds for curved roads is of great significance in terms of reducing the accident rate associated with corners and enriching the driving test scenarios for intelligent vehicles
Summary
Yongtao Liu ,1 Jie Qiao ,1 Yanting Hu, Tengyuan Fang, Ting Xu ,2 Yusheng Xiang ,3 and Yi Han. 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. A descriptive statistics method was adopted by means of data screening and pretreatment. Both a velocity difference estimation model was established and a linear model of velocity differential estimation was constructed. 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 required when the corner radius was less than 300 m. E results can provide a theoretical reference for setting up appropriate safe speed limiting signs on road corners in mountainous areas A safety warning sign was required when the corner radius was less than 300 m. e 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. e results can provide a theoretical reference for setting up appropriate safe speed limiting signs on road corners in mountainous areas
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