You must stop suddenly while driving a tank vehicle that is only half full. What extra risk does the liquid surge create?

Pick an answer

1. Surge only happens in completely empty tanks
2. The liquid surge only affects fuel economy
3. Once the wheels stop turning, the liquid inside stops moving too, since the brakes act on the whole vehicle at once
4. The moving liquid can push the vehicle forward even after the brakes have stopped the wheels, or affect steering control

Correct!

Not quite. The correct answer is highlighted.