General Driving Rules, Signals & Speed Limits

Only flash your headlights to let other road users know that you are there. Do not flash your headlights to convey any other message or intimidate other road users. - [Rule 110](rule_110)

Green/yellow studs indicate temporary adjustments. - [Rule 132](rule_132)

You MUST NOT leave a parked vehicle unattended with the engine running or leave a vehicle engine running unnecessarily while that vehicle is stationary on a public road. - [Rule 123](rule_123)

On a dual carriageway you should stay in the left-hand lane. Use the right-hand lane for overtaking or turning right. - [Rule 137](rule_137)

According to the speed limit rules, the limit for cars and motorcycles in built-up areas is generally 30 mph, but it is 20 mph in Wales. - [Rule 124](rule_124)

If the area is marked with chevrons and bordered by solid white lines you MUST NOT enter it except in an emergency. - [Rule 130](rule_130)

Allow at least a two-second gap between you and the vehicle in front on high-speed roads and in tunnels. The gap should be at least doubled on wet roads and up to ten times greater on icy roads. - [Rule 126](rule_126)

You MUST ensure all sidelights and rear registration plate lights are lit between sunset and sunrise. - [Rule 113](rule_113)

In slow-moving traffic, never get so close to the vehicle in front that you cannot stop safely. The accompanying guidance and image also emphasize that you must not block access to a side road. - [Rule 151](rule_151)

High-occupancy vehicle lanes MUST ONLY be used by vehicles containing at least the minimum number of people indicated on the traffic signs (e.g. 2+). - [Rule 142](rule_142)