Journal of South China University of Technology(Natural Science) >
Design of Speed Limit at Expressway in Rainy Day Considering Drivers’ Visual Search Ability
Received date: 2022-08-26
Online published: 2022-10-09
Supported by
the General Program of National Natural Science Foundation of China(71971097);the Youth Program of National Natural Science Foundation of China(52002143)
In order to solve the problem that drivers cannot accurately recognize the roadside information at expressway due to high speed in rainy day, this study firstly selected vehicle speed, clarity degree of drivers’ visual field pictures, line-of-sight angle and fixation distribution percentage as the attention distribution indicators in rainy day based on the attention distribution theory. And Fisher discrimination analysis method was used to establish the quantitative model of visual search ability. Secondly, a simulation driving software UC-win/Road was used to build an experimental platform. Rainfall intensity and vehicle speed were selected as the influencing factors, the change rule of driver’s attention distribution indicators under the cooperation of the two factors was studied, the relationship between rainfall intensity, speed and visual search ability was established, and the matching scheme between rainfall intensity and speed limit was proposed. The results show that the increase of vehicle speed and rainfall intensity would make it difficult for drivers to observe roadside information. To reduce the driving risk, the driver would change the visual search strategy and increase the focus on the front of the road, which reducing the visual search efficiency of the observation target. Therefore, drivers need to spend more efforts to transfer attention when the matching between rainfall intensity and vehicle speed is unreasonable, resulting in the inability to find roadside information in time. In addition, the overall correct percentage of classification of the model is 85.94%, which indicates that the model can evaluate drivers’ visual search ability. Finally, the speed limit schemes based on stopping sight distance and that considering drivers’ visual search ability of roadside information were compared. The results show that the speed limit calculated based on stopping sight distance is higher. To avoid that drivers cannot accurately identify the roadside information due to the high speed, the speed limit of light-rainy day, moderate-rainy day and heavy-rainy day should not exceed 100, 70 and 50 km/h, respectively.
WANG Linhong, LI Hongtao, LI Ruonan . Design of Speed Limit at Expressway in Rainy Day Considering Drivers’ Visual Search Ability[J]. Journal of South China University of Technology(Natural Science), 2023 , 51(6) : 20 -29 . DOI: 10.12141/j.issn.1000-565X.220552
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