Rev Up and Rule the Road 2025: JJ Keller Entry Level CDL Driver Test Challenge!

To keep a tractor-trailer stationary after stopping, maintaining brake pressure is essential. This ensures that the vehicle remains securely in place, preventing any unintended movement that could arise from gravity or external forces, especially on inclines.

When a driver comes to a stop, particularly with a heavy vehicle like a tractor-trailer, relying on the brakes is crucial for safety. If the brake pressure is not maintained while stopped, the vehicle could roll backward or forward, posing significant dangers to both the driver and surrounding pedestrians or vehicles.

Steering pressure, throttle pressure, and clutch pressure are not needed for stationary control. Steering pressure relates to maintaining directional control, throttle pressure is used to accelerate, and clutch pressure is primarily associated with engaging or disengaging the drivetrain rather than keeping the vehicle stationary. Therefore, brake pressure is the correct focus to ensure that the vehicle remains stopped safely.