Employers have been urged to wake up to the dangers of tiredness among company car drivers.
Health and safety firm Croner said that many employers thought they were only responsible for employees driving company cars, yet safety law covers any vehicle used for work purposes.
New figures from the RAC Foundation show that falling asleep at the wheel is the cause of 20 per cent of accidents on long journeys on major roads and motorways, with ten per cent of company car drivers admitting to previously falling asleep at the wheel.
Employers who don't have a comprehensive occupational driving policy in place risk hefty fines and even a jail sentence, Croner warned.
Trevor Davies, health and safety officer at Croner, said: "Driving is one of the most dangerous work activities and these latest figures reinforce the message that the safety of company vehicle drivers should be paramount for employers."