What is the height of road speed bumps?
2 Answers
Road speed bumps should not exceed 30 cm in width and 5 cm in thickness (height), with two standard lengths of 25 cm and 1 meter depending on road width. Below is relevant information about road speed bumps: 1. Overview: Speed bumps, also called speed humps, are traffic installations mounted on roads to slow down passing vehicles. They typically appear in strip form (sometimes dotted patterns), made primarily of rubber or occasionally metal, with yellow-black color schemes for high visibility. These slightly raised pavement installations force vehicles to reduce speed, commonly deployed at intersections, industrial/mining zones, school areas, residential communities, and accident-prone sections as specialized traffic safety devices for controlling motor/non-motor vehicle speeds. 2. Physical properties: (1) Elongation at break: The surface material elongation should be ≥200% (≥250% for highway/urban road applications). (2) Tensile strength: Surface material tensile strength should be ≥6.0MPa (≥8.5MPa for highway/urban road applications).
After driving to and from work for so many years, I've encountered quite a few speed bumps on the road, and their heights are definitely not uniform. Urban roads usually keep them between 5 to 6 centimeters, while those near residential areas or schools are a bit higher, around 10 centimeters. Last time when delivering goods in an industrial zone, there was a speed bump that stood a full 15 centimeters above the road surface, which really made my sedan's undercarriage suffer. Actually, the height is related to the speed limit—roads with a 40 km/h limit typically have 5-centimeter-high bumps. If they're too high, drivers might brake suddenly, leading to rear-end collisions. I've heard that some places use rubber speed bumps, whose thickness can be adjusted, making them much more reasonable than concrete ones—at least they won't damage the shock absorbers from all the jolting.
