Half of vehicles parked at motorway service stations or in city centre car parks contain uninsured hi-tech possessions worth up to £1,000.
According to a survey of 119 motorists by Supercover Insurance, 61 of them regularly leave uninsured valuable hi-tech equipment like laptops, sat navs, MP3 players and spare mobile phones in their cars. But only 15 knew for certain that they had insurance to cover any loss.
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Carmi Korine of Supercover Insurance said: "What most drivers didn't realise was that the majority of motor insurance policies simply do not cover loss of contents from a vehicle - or have a very low level of cover at best."