No, the weight of a vehicle on the road surface is not the reason it remains stationary when parked. The reason a car remains stationary when parked is due to the force of friction between the tires and the road surface. Friction is a force that opposes the motion of objects in contact with each other. In the case of a parked car, the force of friction between the tires and the road surface is greater than the force of gravity pulling the car down. This prevents the car from moving.
The weight of the vehicle does play a role in the amount of friction between the tires and the road surface. However, it is not the only factor. The type of tires, the condition of the road surface, and the weather conditions can all affect the amount of friction between the tires and the road surface.
