When the curb height is low, it is easy to cause a jump phenomenon when the vehicle collides with the curb stone, which is unsafe for driving; while when the curb is high, the vehicle is likely to cause serious damage to the vehicle after the collision with the vehicle Security is also obscure. The curving effect of curbstones on vehicular vehicles is 35 cm) (30cm> 25 cm> 40 cm> 15 cm> 20 cm). The Chongqing Municipal Transportation Commission has increased the curb height of the sidewalk of the bridge from 25 cm to 35 cm since 2005, effectively reducing the occurrence of traffic accidents, especially severe and major traffic accidents. For the different methods of curbstone, the safety is best when there is no curbstone, followed by the standing curbstone, and the sloped curbstone is the worst. Curb stones play a suitably important role in preventing vehicles from rushing onto the sidewalk.
Relying on the users of highways, one of the main differences between highways and urban roads is that there are many small vehicles on the urban roads, many pedestrians on the sidewalks, small vehicles with low quality and fast speed, and it is easy to roll over after bumping against the edges of urban roads Or the situation of veering, forming a secondary accident with collision with vehicles in the rear and adjacent lanes, increasing the probability of accidents, obscure driving safety, and obscurity to protect vulnerable groups in road use. Judging from the test data, when the curb height is 15 cm and the speed is 60 km / h, a jump occurs, which threatens the safety of pedestrians; when the curb height is 35 cm and the speed is 60 km / h, they are safely blocked. In some cities of Xi'an, curbstones were abolished on the road, and the designers thought that a better landscape effect had been produced. Without considering other factors, it is only proved from the height of curb stones. From the limited research literature, two methods are suggested: one is to revoke curb stones and set up guardrails; the other is to increase the curb stone height values recommended by current urban standards. Up to 35 cm.
The maximum height of stair steps in kindergartens and elementary schools is 15 cm. Considering only the most obscure conditions of road users, namely children and the elderly, the height of curb stones should not exceed 15 cm. The step height should not be greater than 0.16 m. Increasing the height of curb stones is obscure for pedestrians, especially the elderly and children to overcome the height of curb stones.