UK road signs are designed to be understood at a glance. Their shape, colour, and symbols all carry meaning, and the examiner expects you to read them quickly and react correctly without hesitation. Knowing the system reduces uncertainty and helps you make safer decisions.
There are three main types of road sign. Warning signs are triangular with a red border: they alert you to hazards ahead such as bends, junctions, schools, or animals. They do not give orders; they simply tell you to be careful. Regulatory signs are circular and give orders you must obey. A red circle means prohibition: no entry, no overtaking, no U-turn. A blue circle means a positive instruction: you must follow the direction shown, such as a left turn ahead. Information signs are rectangular and provide guidance: directions, distances, parking, and services.
Speed limit signs are regulatory and must be obeyed. A red circle with the number in black shows the maximum speed. A minimum speed sign is a blue circle with the number in white. Speed limit repeater signs are smaller versions placed along the road to remind you. National speed limit signs (a white circle with a diagonal black line) cancel previous restrictions and return you to the default limits for the road type.
Temporary signs use a yellow background and cover roadworks, diversions, and temporary speed limits. They have the same legal force as permanent signs and must be obeyed. Ignoring a temporary speed limit at roadworks is a serious fault on a driving test.