An estimated 2.6 million vehicles are being driven on the UK's roads with defective lights.
According to a study undertaken by Halfords, over one in ten cars checked in ten major cities in the UK were found to have a faulty headlight, sidelight, rear or brake-light.
Motorists in Glasgow were found to be the worst offenders when it came to driving with defective lights on their vehicle, with 13.3 per cent of cars suffering the problem.
Newcastle was not far behind in terms of poor car maintenance as 13.1 per cent of its vehicles were on the roads with lights that were not in full working order.
The importance of driving with lights that work correctly was highlighted recently by figures from the Department for Transport, which revealed that 357 accidents in 2010 were blamed on vehicles not displaying lights at night or during periods when visibility was diminished.
Dave Poulter, Halfords director of trading for auto said: “Usually you don’t know when a light has gone so regular checking is essential, especially in these increased hours of darkness and often more difficult and hazardous autumn and winter conditions."
London proved to be the city where maintenance standards were highest in terms of lights, as just 6.8 per cent of vehicles were found to have defective lights, but even this small percentage means that thousands of motorists would be breaking the law by getting behind the wheel.
The scale of the problem in the UK is reflected in MOT failure rates with 1.16 million cars tested in 2012 falling short of required standards because of the condition of their lights.
Mr Poulter explained: "We know motorist have delayed essential repairs and many wait for the MOT but this is a false economy and such drivers risk falling foul of the law."
Regularly monitoring and checking all the lights on a vehicle is recommended and those who do not feel comfortable doing this can contact a trained professional.
Posted by Danielle Barge