Nearly four in five motorists have engaged in potentially dangerous activities while driving in the last month.
Two in five have driven while tired, 16 per cent have used a hand-held mobile phone and 14 per cent have driven after an alcoholic drink.
Also, 36 per cent have eaten while driving and 28 per cent have driven at excessive speed, the survey from Sainsbury's Car Insurance found.
As many as 22 per cent have driven after a drinks session the night before, 14 per cent have driven while reading a map and ten per cent inflicted road rage on a fellow motorist.
In addition, nine per cent had limited visibility from dirty windows, eight per cent tailgated and seven per cent drove with a pet loose.
Men were more likely to be guilty of bad driving habits than women, with drivers in Greater London owning up to the most offences.
Sainsbury's car insurance manager Joanne Mallon said: "We all have a few bad habits but some of these can be more dangerous than we think."