In general, which of the following should a driver do before entering a tunnel?

Ensure that full headlights are switched on.
Switch on hazard warning lights to alert other traffic of their presence.
Ensure that dipped headlights are switched on.
Only use dipped headlights if there is other traffic in the tunnel.

Explantion: In general, a driver should switch on their dipped headlights before entering a tunnel.

Managing Risk