A new study reveals daytime running lights (DRLs), which have been required to be fitted to all new cars since 2011, may be causing confusion for drivers.

Drivers could be causing confusion for other motorists by relying DRLs for illumination in low visibility conditions, the study has found.

A study conducted by the RAC asked 2,061 drivers and found 62% claimed to have seen other vehicles with lights on at the front in dull and overcast weather conditions but not at the rear. 15% say they had not noticed this, while 23% were unsure.

EU law has required all new cars and small vans sold in Europe to be fitted with DRLs at the front of the vehicle since 2011 in an effort to improve road safety, but they are intended to complement dipped headlights rather than replace — and are dimmer as a result. It’s also not a legal requirement for DRLs to be fitted at the rear of a car, although some manufacturers choose to fit them.

When asked if they knew the car they drove most frequently had DRLs fitted, 47% said their car did not, 29% said they only had them up-front while 14% claimed to have them both front and back. Further still, 8% said they knew their car had them at the front of their vehicle — but were unsure about the rear.

Pete Williams, RAC road safety spokesperson, said: “This is potentially a very worrying finding as it implies that many motorists are driving without any rear lights believing that because they have running lights that switch on automatically at the front, they are also on at the rear.

“Alternatively, and arguably just as concerning, these drivers could simply have decided the light conditions were not bad enough to merit turning on their dipped lights or sidelights.”