English 
how to read speedometer
The reading method of the automobile odometer is: 1. Open the door on the driver's side and step on the brake pedal of the automobile to prepare to start the engine; 2. Press the one button start button of the car, and all the instrument lights of the car will light up, proving that the car engine is started; 3. Press the top of the toggle lever on the right side of the steering wheel once and hold it for more than 5s to display the mileage. The vehicle odometer is composed of a speedometer and an odometer. The speedometer indicates the speed of the vehicle per hour in kilometers per hour, usually in front of the driving position. The vehicle speedometer represents the running speed of the current vehicle. This speed is calculated according to the wheel speed sensor on the drive wheel axle, and is calculated by the preset formula according to the wheel diameter of the vehicle when it leaves the factory. It is an estimated value rather than an accurate value. If the tire specification of the vehicle changes, or the wheel diameter changes due to wear, the speed displayed on the instrument panel of the vehicle will also have a slight error, but the difference is not significant. Generally speaking, the real speed of the vehicle should be 2-4km/h lower than the speed displayed on the instrument panel.
The speedometer is used to view the application of driving speed, and supports two units: mile/hour or kilometer/hour. The speedometer function requires strong GPS signal support, and can display up to 220 km/h.
1. If there are two lanes in the same direction, the minimum speed of the left lane is 100km/h;
2. If there are more than three lanes in the same direction, the minimum speed of the leftmost lane is 110 kilometers per hour, and the minimum speed of the middle lane is 90 kilometers per hour;
3. There are only four roads in the same direction. The first road on the right is the freight lane, where the speed cannot be lower than 60. The second road is the freight lane, where the speed cannot be lower than 80. The third road is the passenger lane, where the speed cannot be lower than 100. The first road on the left is the overtaking lane, which cannot be lower than 110;
4. The driving speed of the lanes shall be indicated on expressways. The maximum speed shall not exceed 120 km/h and the minimum speed shall not be less than 60 km/h;
5. The maximum speed of small passenger cars running on expressways shall not exceed 120 kilometers per hour, other motor vehicles shall not exceed 100 kilometers per hour, and motorcycles shall not exceed 80 kilometers per hour.
Get a Quote / Info