Driving a motor vehicle at a speed in excess of that permitted. Unless road signs specifically indicate otherwise, the speed limit on roads in built-up areas is 30 mph. On other roads, the limit for cars and vans weighing up to 2 tonnes when fully laden is 60 mph on single carriageways and 70 mph on dual carriageways and motorways (unless towing a trailer or caravan, when the limit is 50 mph and 60 mph respectively). Buses, coaches, and lorries weighing more than 7.5 tonnes laden can drive at speeds of up to 50 mph on single carriageways, 60 mph on dual carriageways, and 70 mph on motorways. The limit for goods vehicles weighing more than 7.5 tonnes is 40 mph on single carriageways, 50 mph on dual carriageways, and 60 mph on motorways.
The penalty for speeding is a fine, endorsement (carrying 3–6 penalty points under the totting-up system), and discretionary disqualification. When section 17 of the Road Safety Act 2006 is brought into force, the range of penalty points will increase. A person cannot be convicted of a speeding offence on the evidence of one witness alone, but the evidence of two police officers unsupported by a speed-measuring device may be enough to secure a conviction. Speeding may itself be evidence of careless and inconsiderate driving or dangerous driving, but it is an offence in its own right even if it caused no danger. Speeding offences are subject to the requirement of a notice of intended prosecution.