What is the unit of speed for motor vehicles?

[MacKevin]

The unit of speed for motor vehicles is kilometers per hour. Below is an introduction to the speeds corresponding to different gears and the effects of speed and gear mismatch. Speeds corresponding to different gears: Starting in low gear, usually 1st gear is used, with an economical speed range of 15 to 20 km/h for 1st gear; 25 to 40 km/h for 2nd gear; 40 to 60 km/h for 3rd gear; 60 to 75 km/h for 4th gear; and above 75 km/h for 5th gear. Effects of speed and gear mismatch: If during a test the speed and gear cannot be properly matched, the only option is to fail and retake the test. Frequently doing this in actual driving increases wear between the transmission gears and can also damage the clutch. The consequence of low speed with high gear is stalling the car and causing engine shaking.

[Peyton]

I've been driving for over ten years, and the most common unit for vehicle speed is kilometers per hour, commonly referred to as km/h. In China, speed limit signs on the roads are marked with this unit, and the speedometer on the dashboard also displays speed in this unit. Not being aware of this can easily lead to speeding fines or even accidents. For example, once when I was driving at night, I didn't pay attention to the speed unit and exceeded the limit slightly, resulting in a 200 yuan fine. When traveling abroad, you also need to be careful, as in the United States they use miles per hour, abbreviated as mph, where 1 mph is approximately equal to 1.6 km/h. Confusing speed units can affect safe driving, so it's important to develop the habit of checking the dashboard regularly.

[CharlesLee]

For those frequently dealing with cars, the speed unit is usually kilometers per hour (km/h), which is the global standard. The speedometer on the dashboard is set according to the vehicle's factory settings. If the unit is displayed incorrectly, it may indicate a sensor or system malfunction. The conversion is simple: 1 mile per hour is approximately equal to 1.6 kilometers per hour. During maintenance, when checking tire pressure and size, consistent units are essential for accuracy. For example, when switching to larger tires, the speedometer might display inaccurately. Understanding this can prevent misreading data and assist in daily maintenance. Remember to calibrate the dashboard regularly to ensure accurate readings and avoid affecting driving judgment.

[SanLilliana]

When I was learning to drive, the first thing my instructor told me was that the speed unit for motor vehicles is kilometers per hour, abbreviated as km/h. At the driving school, all simulated road signs use this unit, and the dashboard displays it clearly. Remembering the unit is crucial to prevent new drivers from speeding. Always pay attention to the numbers on speed limit signs when driving—safety comes first.