The DVSA has revealed motorists ignoring a crucial van rule could be caught out and slapped with penalties.

Drivers could avoid being hit with a major penalty by turning on a switch located in most cars on UK roads.

Motorists are at risk of losing thousands of pounds and being hit with penalty points due to common problems experienced during hot weather.

Drivers could be issued a fine of up to £5,000 for breaking a little-known motoring rule this summer.