Fleet managers are being warned to be aware of the dangers of unrestrained loads in cars and vans.

Tools and equipment left unsecured can turn into “missiles” in the event of a crash, according to insurance company Norwich Union. The company’s motor risk manager Bill Pownall said the effect could be fatal.

“There have been at least two recent fatal accidents involving unrestrained loads,” he said.

“With many fleet drivers switching to estate cars the situation could be worsening.

“Light commercial vehicles and car-derived vans are often fitted with load restraining features, which are not always available on estate cars.”

The comments come as the Transport Research Laboratory (TRL) announced it has begun investigating problems arising from the incorrect loading or placement of materials in vans.