ABSTRACT
Traffic disasters rain significantly affect the stability of the road traffic system by increasing the driver's workload and affecting the driver's visual recognition ability, posing hidden dangers to driving safety. Relevant scholars have researched the influence of rainfall intensity on atmospheric visibility and visual recognition distance, but there is still a lack of relevant research on the rain characteristic indicators of traffic disasters that affect visual recognition distance. Starting from the driver's visual recognition needs, this paper explores the factors affecting the visual recognition ability to drive in rainy weather and finds that the “raindrop median diameter D50” can effectively express the impact of traffic disaster rain on the driver's visual recognition ability, thereby defining the traffic disaster rain. Through the natural disaster driving visual recognition experiment on rainy days, the visual recognition distance of 20 randomly selected car drivers under different raindrop characteristics during the day was collected. Studies have shown that under the conditions of daytime traffic disasters rain, the color temperature, illuminance, and raindrop median diameter D50 all affect the visual recognition distance. The visual recognition distance decreases with the increase in D50 and color temperature, as well as with the decrease in illuminance. The research methods and conclusions can provide a theoretical basis for the speed limit strategy of traffic disasters on rainy days, and provide technical support for the intelligent management of traffic disasters on rainy roads.
