New research has found that around 2.6 million cars are being driven illegally on British roads due to defective or faulty front and rear lights.
The study has been released to not only warn motorists of the penalties faced should the authorities notice a faulty light but also to point out the safety ramifications of driving in the dark and often poor weather conditions of winter without fully functioning lights.
One in ten vehicle checked in the study by Halfords was found to have a failed headlight, sidelight, rear or brake light judged to significantly increase the risk of an accident.
The findings coincide with the fact that around 1.16 million cars tested in 2012 fell short of MOT requirements due to the condition of lights.
The study saw researchers travel to 10 major cities in the UK, where they surveyed passing motorists at busy junctions and noted down any cases of faulty lights.
Glasgow, where 13.3% of vehicles were found to have defective lights, was rated the worst city – just ahead of Newcastle upon Tyne with 13.1%. The most notable amount of defects occurred in the brake lights, making it difficult for drivers to judge whether the car in front is slowing.
London, where just 6.8% of vehicles were found to have faulty lights, proved to have the best maintained automobiles.
Motorists are warned that driving with defective lights can carry a £60 penalty and three points on the licence.