What should a driver do if traffic comes to a halt in a tunnel?

Select a low gear and keep the engine running.
Switch off the engine.
Switch on front and rear fog lights.

Explantion: If traffic comes to a halt in a tunnel, switch off your engine to prevent a build up of fumes in the tunnel. Stay patient and follow the instructions of the tunnel operators.

Theory Tester

What should a driver do if traffic comes to a halt in a tunnel?

Managing Risk