Must a driver apply the handbrake before leaving a parked car in Northern Ireland?

Yes. The Northern Ireland Highway Code says drivers must apply the handbrake before leaving a vehicle.

Rule 239 also requires the engine, headlights and fog lights to be switched off before leaving the vehicle, with appropriate safeguards for securing it. Leaving the transmission in gear or selecting Park can add security but should not be used as a substitute for correctly securing the vehicle. On a slope, turn the wheels appropriately and check the car cannot roll. A vehicle moving after being left unattended may cause serious injury or property damage.