Automatic transmission rollback usually occurs on relatively steep slopes and is caused by the clutch automatically disengaging or having too little engagement force. Even when the accelerator is pressed, it takes time to buffer, so the vehicle may feel like it's rolling backward. This situation can generally be prevented by shifting into D gear. Once the vehicle starts rolling back, it is also highly likely to stall. This is because the work done by the engine at this time is not only used to provide the mechanical energy for the vehicle to start but also needs to overcome the kinetic energy of the rolling backward. When parking on a slope, if someone is inside the car, in addition to pulling up the handbrake, the foot should also be placed on the brake pedal. Note that the gear should not be in neutral but should be in 1st gear or drive gear to ensure the car maintains forward inertia. If no one is inside the car, extra attention should be paid to safety. Besides pulling the handbrake and shifting into drive gear, triangular wooden blocks should be placed behind the wheels to ensure the car does not roll backward. For manual transmission cars, rolling back during startup is generally caused by improper operation by the driver. Normally, the clutch should be released first, waiting until the car's forward driving force counteracts the backward gravitational force before releasing the brake, which will reduce rolling back.
