Bump gate

By gently contacting the swinging bump gate with the front of a vehicle and then accelerating, the gate is pushed open, allowing the vehicle to pass.

Accordingly, a bump gate is unsuitable for long vehicles, but some installations incorporate a time-delay return mechanism.

Instead, it is fastened to cylinders that loosely encircle a tall post.

After the vehicle passes through, gravity causes the gate to swing back into the closed position.

Extra skill is needed not to bump the gate so hard that the other end swings around to strike the rear of the vehicle.