If you are stopped inside a tunnel due to traffic conditions, what should you do?

A)Switch on only the hazard warning lights.
B)Stop as close as possible to the vehicle travelling in front.
C)Keep the sidelights on, and stop as far away as possible from the vehicle ahead.Correct
If a vehicle is immobilised inside a tunnel or underpass due to traffic conditions:
- The driver and passengers must not leave the vehicle.
- In this case, the hazard warning lights should be switched on temporarily to warn other drivers travelling behind.
- The sidelights must be kept on.
- The engine must be switched off.
- You must keep as far away as possible from the vehicle ahead.