How to Measure Speed?
2 Answers
By measuring the rolling radius of the tire, the distance covered by the number of rolling revolutions of the tire circumference, and calculating the differential ratio and transmission ratio. By measuring and calculating the cumulative displacement of the trajectory within a unit time, it is comprehensively converted into speed and mileage, which is displayed on the screen.
As someone who has driven for many years, I think the simplest way to measure speed is to look at the speedometer on the dashboard. It connects to wheel sensors and calculates the speed in real time, which is mostly accurate. If you suspect it's inaccurate, you can choose a straight road section to check tire pressure or compare it with a mobile GPS app—apps like Amap can display speed in real time. The manual measurement method is also practical: for example, measure a 100-meter distance after parking, drive through at a constant speed and record the time, then divide the time by 60 to get the speed, but don’t get too distracted while driving. Safety is key—control your speed and avoid speeding, and pay extra attention to road signs in the city. Remember that speed perception can change on different road surfaces, such as during rain, so calibrate your equipment regularly to ensure reliability. This method is sufficient for daily use, hassle-free and efficient.
