What is the unit of measurement for vehicle speed?

[StJulianna]

The commonly used units for vehicle speed are kilometers per hour or meters per second. Here is some knowledge about vehicle speed: 1. Vehicle speed units: There are two units to express vehicle speed, one is kilometers per hour, and the other is miles per hour. Based on the calculation that 1 mile is approximately equal to 1.6 kilometers, a speed of 80 mph is equivalent to 129 kilometers per hour. 2. Speed limit regulations: At intersections, densely populated areas, downhill slopes, locations with warning signs, or when turning or making U-turns, the maximum speed for trucks carrying flammable or explosive hazardous materials is 15 km/h.

[DeNicole]

I've been driving for over a decade, and the most commonly used speed unit in vehicles is kilometers per hour, abbreviated as km/h. That's basically how it is here in China. The number displayed on the dashboard shows the real-time speed in km/h. For example, with a city speed limit of 60km/h, I drive steadily without exceeding it to ensure safety. On highways, the maximum is 120km/h, and you must be careful not to speed, otherwise accidents can easily happen. I also know that American friends use miles per hour (mph). 1mph is roughly 1.6km/h, so the number appears smaller but the actual speed isn't low. Don't underestimate unit differences—when traveling or driving in border areas, they can easily cause confusion and increase risks. Additionally, some older cars have different speedometer units, but digital displays nowadays are much clearer. Understanding these units helps you follow traffic rules, avoid fines, and most importantly, keeps everyone safe.

[VioletFitz]

As a student, I was curious about vehicle speed units while studying physics. The teacher said km/h is mainstream, but the US uses mph. Converting 1mph to approximately 1.609km/h is interesting—why do countries differ? It's said to be due to historical measurement reasons. When test-driving my father's car, I noticed the dashboard displays km/h digitally, which is fun. Navigation apps like Gaode Map also show real-time speed. Learning units isn't just for exams but also helps avoid speeding accidents and prepares you for travel abroad by practicing conversions—turning numbers into a game makes learning fun. Even race car drivers discuss speed in km/h. Understanding this unit is basic knowledge for modern life, making driving safer and smarter.

[StIris]

In the memory of driving an old-generation car, the most familiar speed unit was kilometers per hour (km/h). Back then, our car's speedometer had analog needle displays—simple yet accurate. I recall one instance where a momentary confusion over units almost led to speeding, but fortunately, I reacted in time. Nowadays, cars are digital, with km/h being the primary unit, making things much safer, though mph is occasionally encountered in some regions but rarely used. Speed limits have changed, but the units remain the same—like 60 km/h in urban areas and 120 km/h on highways—which I’ve always adhered to. New drivers should practice more to get accustomed to these units, as understanding them is fundamental to safe driving—never overlook the details. Old experience taught me that clear units prevent confusion, avoiding road accidents, vehicle damage, or even loss of life, which is never worth the risk.