Speed Limits Theory

For cars, the national speed limit is 60mph on single carriageways and 70mph on dual carriageways and motorways. Roads with street lights are usually 30mph unless signs say otherwise, and in Wales the default on most of these roads is now 20mph. Questions also cover limits for vehicles towing trailers. You may need to identify the correct limit from road signs and road types. Different vehicles can have lower limits, so check the rules that apply to the vehicle you are driving. Weather, traffic and road conditions can also affect the safe speed. Speed limits can change along a route. Look for signs when entering a new road or area. Keep checking for changes instead of relying on the limit from the previous road.

Remember that a limit is a maximum, not a target — many questions test when it is safer to drive below it. A lower speed may be needed on a busy road, near a hazard or when visibility is poor. Good speed control is an important driving skill. You should choose a speed that gives you enough time to see hazards and react safely. Practising these rules can help you understand speed limits before your driving test. Regular revision can make speed rules easier to remember. Learn the main limits first, then practise questions about different roads and vehicles.