Two thirds of drivers have confessed to having been so tired behind the wheel that they could easily have fallen asleep.

The survey, by Motorpoint, also found that more than a quarter of those asked said they would not stop for a fatigue break, preferring to drive on and to try to stay awake.

This confirms a survey by Skoda, which found that few business car drivers take the recommended break, with only one in seven drivers following the advice.

Worryingly 17% of company car drivers never take a break from driving due, they say, to time pressures.