What unit is used to measure car speed?

[DeBenjamin]

There are two units used to indicate vehicle speed: km/h and mph. The speed unit used in China is km/h. 1mph=1.609344km/h, 1km/h=0.6213712mph. Below are relevant explanations: 1. Different vehicle series use different units: Generally speaking, Japanese, Korean, and German cars tend to use kilometers per hour (km/h) to indicate speed; American cars usually use miles per hour (mph), which depends on the country. 2. Explanation of horsepower: Horsepower is an important parameter of an engine, referring to the work done by the engine per unit time. This means that for cars of the same mass, the greater the engine's power, the higher the car's speed value. 3. Vehicle speed regulations: Motor vehicles must not exceed the speed limit signs when driving on roads. On roads without a centerline, the speed limit is 30km/h for urban roads and 40km/h for highways. On roads with only one motor vehicle lane in the same direction, the speed limit is 50km/h for urban roads and 70km/h for highways. When making turns, the maximum speed of motor vehicles must not exceed 30km/h.