if the car is not registered, either he is using fake registration number and roadtax. when roadblock the police or jpj find out will sita the car, the driver might be end up in court.
if the car is registered and due to a big accident and become a kereta potong, no one will know it. it may cause by the workshop using wrong method of kereta potong to repair the car. the car cannot change the owner if it fail the puspakom inspection