In a survey conducted by Sainsbury's car insurance, 7.2 million of Britain's 37 million drivers have admitted to taking their satnav's estimated journey time less as advice, and more as a challenge.
"Our research shows a worrying trend of drivers racing against the projected arrival time set by their GPS systems" said Ben Tyte, head of Sainsbury's car insurance division.
“We are encouraging drivers using this new driving technology to have the safety of any passengers, other road users and pedestrians at the forefront of their minds and not be tempted to become GPS racers."
In pursuit of their personal bests, Sainsbury's say that 570,000 drivers speed through amber traffic lights, 340,000 admit to overtaking on blind bends, while another 240,000 have tailgated other cars.
The study also claims that 150,000 people have admitted to being injured in collisions while racing their own GPS system.