Drivers must report 10 medical conditions - including the use of some medications - or their insurance may be void.
Motorists have been warned to they have to inform the DVLA if they have any condition that could prevent them from getting in the driving seat.
Quotezone.co.uk experts have pinpointed a list of conditions that could prevent drivers from legally being on the road or could invalidate their insurance and leave them unprotected in an accident.