ALMOST 50pc of drivers admit they flash their lights to warn other drivers of a speed check, according to a new poll.
The survey, by the Institute of Advanced Motorists (IAM) found the key reason for doing so was to save another motorist from being caught or fined.
Nearly 70pc said a driver should not be prosecuted for warning others – only 21pc believe they should.
According to the IAM, flashing appears to be an accepted form of communication between drivers.
Nearly 35pc say they ‘use their lights to tell other drivers they are giving way to them’, and 30pc ‘use them to thank another driver for giving way to them’. Less than 10pc said that they don’t flash at all.
The fact that nearly as many people use their lights to thank another driver, as those who use them to invite another driver to come through, suggests there could be confusion as to what message people are trying to get across.
IAM chief examiner Peter Rodger said: “The biggest reason for not flashing to warn of a speed check is safety, with ‘drivers who speed deserve to be caught and fined’ and ‘the meaning of the flash could be misinterpreted’, each polling a third of the votes from those who don’t flash.
“However, safety was also used as a major justification for those who do flash to warn of speed checks, with nearly 20pc saying they ‘wanted to avoid a possible collision when drivers see the speed check late and brake harshly in response’.”