Transport planning may have been made easier thanks to the latest satellite navigation technology, but business drivers should not rely completely on the devices.
That is the view of the Institute of Advanced Motorists (IAM), which claims that too many motorists who drive for a living are "blindly" following their sat navs' instructions.
According to a recent survey by motoring.co.uk, some 20 per cent of women and 30 per cent of men have followed the devices into the middle of a field.
Meanwhile, the number of lorry drivers becoming stuck in narrow, rural roads after blindly trusting their sat navs' directions also continues to rise.
Peter Rodger, chief examiner at the IAM, said sat navs can help boost road safety and efficiency, provided the driver already has an idea of where they are heading.
"Have a map as a fall back and remember satnavs are no more infallible than the person who uses them, so do have some idea of your route before you set out," he added.
According to organisers of next year's Commercial Vehicle Operator Show, a good route planning and logistics system is vital to reducing mileage, cutting fuel costs and slashing delivery times to customers.
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