Must you switch off car fog lights before leaving it parked in Northern Ireland?

Yes. The Highway Code says drivers must switch off the engine, headlights and fog lights before leaving a parked vehicle.

Rule 239 distinguishes compulsory actions from recommendations such as locking the vehicle. Parking lights or sidelights may still be required at night in some locations under separate rules. Do not turn off mandatory parking lights just because the headlight or fog-light requirement says to switch those lamps off.