Employers which have threatened their staff with their bonuses being removed after an accident have found drivers lie about who was driving to keep the money.
Staff who then take the blame for a colleague get a share of the bonus, according to Dr Will Murray, research director, Interactive Driving Systems.
He believes the threat of losing a bonus should play no part in an incentive scheme designed to improve the performance of company car drivers.
Murray, who also chaired the Fleet Safety forum, said: 'We need a culture change in driver attitudes.'
Interactive Driving Systems is working with BT, which is trying to cut an annual bill of more than £20 million for repairing vehicles after accidents.
Dave Wallington, BT group safety adviser, said: 'That comes off the group's bottom line but it is only the start. Estimates of extra costs related to accidents vary from twice as much as repairs to eight times more.
'Bent metal – especially third party claims – is a significant overhead and needs to be managed.
'Our staff face high-risk driving – that's not the same as them being high-risk drivers. Vehicles can be damaged when they are up a ladder.'