Drivers will be banned after just two convictions if they exceed the speed limit by 15mph in urban areas or 25mph on motorways under a shake-up of road safety laws.

Tougher penalties, to be announced next month, will mean drivers get six points for travelling at 45mph in a 30mph area, 55mph in a 40mph zone or 95mph on motorways throughout Britain.

The regulations will be enforced by digital cameras tracking average speeds over long distances rather than Gatso cameras, which record speeds at a single point.