What is required to secure a towed vehicle on a hill?

To secure a towed vehicle on a hill, utilizing parking brakes is crucial. Parking brakes, also known as emergency brakes, provide an additional layer of security, especially on inclines. They are specifically designed to hold the vehicle in place when parked, preventing it from rolling away due to gravity.

While applying the handbrake might seem like it could be sufficient, the term "handbrake" can apply to both manual and automatic vehicles but is synonymous with parking brakes and may not be as effective on its own. Wheel chocks can offer valuable support in preventing movement and are often used in conjunction with other methods for added safety. The automatic transmission in the 'park' position can help secure a vehicle on level ground, but it is not entirely reliable on a hill without the additional measures provided by the parking brakes. Therefore, the most effective method to ensure a towed vehicle remains stationary on an incline requires the engagement of parking brakes.