What are the speed requirements for shifting gears in a car?

[McHayden]

Start in first gear, shift to second gear when reaching 10 km/h, shift to third gear at 20 km/h, shift to fourth gear at 30 km/h, and shift to fifth gear at 40 km/h. Gear shifting should be completed within 100 meters, with the gear order increasing sequentially from low to high. Below is a detailed introduction about car gears: 1. Speed aspects: First gear corresponds to a speed of 0-5 km/h. Second gear corresponds to 5-20 km/h, third gear to 20-40 km/h, fourth gear to 40-60 km/h, and fifth gear to 60-100 km/h. 2. Gear shifting timing: Generally, the gear shifting timing for most cars is when the engine reaches 2000 rpm, and should not exceed 2500 rpm. For some high-displacement, high-power engines, shifting can be done around 3000 rpm.