Will an Automatic Car Roll Without the Handbrake On?
1 Answers
An automatic car will not roll after being turned off and shifted into P gear, provided the vehicle is parked on a flat surface. This is because the P gear in an automatic transmission is a locking gear. Additional details are as follows: 1. On a slope: If the slope is steep, the force generated by the vehicle's own gravity may exceed the locking force, causing the vehicle to roll. Therefore, it is recommended to engage the handbrake after shifting into P gear in an automatic car. 2. P gear: This is a special neutral gear that mechanically locks part of the transmission output shaft to secure the vehicle. Its function is to act as a brake after parking, preventing the vehicle from moving. For practical safety reasons, car manufacturers place the P gear in the first position on the gear shift console and set internal mechanisms to ensure that the car key can only be removed when the gear shift lever is moved to the P gear position. Thus, the P gear is specifically designed for long-term parking in automatic cars.