How does the parking brake assist in starting on a hill?

The parking brake serves a crucial function when starting on an incline by preventing the vehicle from rolling backward. When a driver prepares to start on a hill, engaging the parking brake ensures that the vehicle remains stationary until the driver is ready to accelerate. As the driver begins to release the brake and apply the throttle, the parking brake holds the vehicle in place, allowing for a smoother transition into motion without the risk of rolling back. This is particularly important for maintaining control and safety, as rolling backward can lead to accidents or loss of control.

Other options do not accurately describe the role of the parking brake in this situation. For example, allowing the vehicle to roll back slightly is counterproductive; a primary purpose of the parking brake is to prevent that very occurrence. Limiting speed while going uphill is not a function of the parking brake, as it is primarily intended for securing the vehicle when parked or starting on an incline. Additionally, steering ease is unrelated to the function of the parking brake in this context. Therefore, the accurate understanding is that the parking brake effectively prevents the vehicle from rolling back, facilitating a safe start on a hill.