Can you drive a car if a rear position light has failed and the hazard warning lights do not work?
Explanation
If a rear position light fails in the dark or in poor visibility and the hazard lights do not work, the rules let you carry on, but to keep the vehicle visible you must fix a breakdown warning triangle to its rear.
KET reference: KET 92: If, in the dark or in poor visibility, at least one rear position light has failed and the hazard warning lights do not work, a breakdown warning triangle must be fixed to the rear of the vehicle to continue.