What does a car traveling at 80 per hour refer to?

[DelWalter]

Car travels 80 kilometers per hour. Kilometer refers to a unit of length, commonly known as a kilometer, represented in English as km (kilometre). In May 1790, a special committee composed of French scientists proposed that one forty-millionth of the total length of the Earth's meridian passing through Paris be used as the length unit meter. More related information is as follows: 1. Introduction: Car speed is one of the important components of vehicle operation. If a driver cannot control the car speed well, it will lead to traffic hazards or even loss of life. Speed limits are clearly stipulated in many countries, and violating speed limit regulations will result in the revocation of the driver's license. 2. Speed calculation method: Every car has a speedometer. A meter installed in the car can measure how fast the vehicle is moving at any given time. The meter has two units of measurement, miles and kilometers. When the needle points to a number, the indicated number is the speed of the car.

[StDakota]

After driving for so many years, the units must not be careless! 80 kilometers per hour is quite common outside urban areas, and this is the standard speed limit for urban expressways. In China, kilometers are used, so seeing 80 on the dashboard means kilometers. However, in places like the US and UK, 80 refers to miles—which converts to over 128 kilometers. The worst thing about driving is mixing up the units. Once when I was driving abroad, I almost mistook 80 kilometers for 80 miles—fortunately, I noticed the speed limit sign on the roadside in time. The perception of speed varies greatly depending on road conditions. At 80 km/h on the highway, it feels relaxed, but driving at this speed in rain or fog makes me nervous.

[DeMason]

The unit of car speed is absolutely crucial—80 kilometers per hour and 80 miles per hour are completely different things. Most common car models have speedometers marked in kilometers, and you won't even hit half throttle at 80 km/h. But if you're driving a U.S.-spec car and overlook the unit, hitting 128 km/h past a speed camera will definitely get you a ticket. I pay extra attention to unit conversions when modifying cars, especially when tuning ECU parameters, where precision down to the decimal point is essential. In fact, many accidents happen because drivers mix up kilometers and miles, particularly with imported cars provided by rental companies, where this issue is most likely to occur.

[VonLawson]

I was also puzzled by this question when I just got my driver's license. The instructor repeatedly emphasized that speed in China is measured in kilometers, so 80 on the dashboard means 80 kilometers per hour. This speed seemed incredibly fast when practicing parallel parking in the training ground, but it's actually considered slow lane speed on highways. Unit confusion can be dangerous, so always confirm whether the dashboard displays km/h or mph when renting a car abroad. I remember last year in Scotland, a friend mistook 100km/h for 100 miles per hour and got chased by police for three kilometers!