What is the unit of car speed?
2 Answers
Car speed: The distance a car travels per unit of time, referred to as speed. Common units are kilometers/hour or meters/second. Below is some related knowledge about car speed: 1. Conventional speed: The most fuel-efficient speed is generally within 50~80% of the engine's maximum RPM, with average speeds typically being 50 km/h in cities and 100 km/h on highways. 2. Significance: Car speed is one of the three parameters used to describe traffic and holds an important position in the study of traffic flow theory. Car speed can also broadly refer to motor vehicle speed. To suit different purposes, car speed is mainly categorized into spot speed, segment speed, and design speed. Spot speed is the instantaneous speed of a car passing a specific point on the road. The arithmetic mean of a set of spot speed observations is the average spot speed.
The speed unit on a car's dashboard is usually kilometers per hour, commonly referred to as km/h. I remember when I first learned to drive, I wondered why we didn't use meters per second. Later, I realized this unit is more practical. A speedometer showing 80 km/h means the car can travel eighty kilometers in one hour. All cars in China, including navigation prompts, use this standard unit, ensuring uniformity to avoid confusion. However, I heard that in the U.S., they use miles per hour (mph), which is quite a hassle to convert—1 mph is approximately 1.6 km/h. The most important thing when driving is to pay attention to this number, especially in speed-limited areas. Once, I drove a friend's imported car with mph printed in small letters on the outer edge of the dashboard and almost got a speeding ticket.
