Motor Bridge UK | UK Motoring Guide
Road signs help drivers recognise hazards, understand restrictions and navigate Britain's roads safely.
From speed limits and warning triangles to motorway directions and temporary roadworks signs, recognising what signs mean helps you respond appropriately and comply with the rules.
Explore this interactive Motor Bridge guide to learn the basics, discover commonly misunderstood signs and test your knowledge.
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01 | Understanding the basics
The UK uses a system of shapes, colours and symbols to communicate important information quickly.
There are three main groups: signs giving orders, signs warning of hazards and signs providing information or directions.
Usually instructions, restrictions or prohibitions.
Usually alert you to hazards or changes ahead.
Often provide directions, route information or other instructions.
02 | Signs giving orders
Circular signs generally give orders. Some tell you what you must not do, while others give positive instructions.
Red rings or circles generally indicate prohibitions or restrictions.
Examples include maximum speed limits, no entry and restrictions on certain vehicles.
The precise requirement depends on the sign's symbol, wording and any accompanying plate.
No. A signed maximum speed limit is a legal maximum, not a target.
You must not exceed the applicable limit, and you may need to drive considerably slower when road, traffic or weather conditions require it.
Blue circular signs generally give positive instructions or indicate routes reserved for particular classes of traffic.
Examples include keep left, turn left and routes for buses or cycles.
No. Where a sign gives a mandatory instruction, drivers must comply with it.
Always check the full sign and any qualifying information.
03 | Warning signs
Warning signs are mostly triangular with red borders. They alert drivers to hazards or road conditions that may require extra care.
It may warn of an approaching crossroads, side road, T-junction or another junction layout.
The symbol indicates the type of junction or road layout ahead.
Approach at a speed appropriate to your visibility and the circumstances.
They can alert you to pedestrian crossings, school-related hazards and other situations where people may enter or cross the road.
Be prepared to slow down and follow the applicable crossing rules.
It warns that the road surface may be slippery in relevant conditions.
Adjust your speed and driving to the actual road conditions, allowing additional stopping distance when necessary.
Animals may be present on or near the road.
Examples include cattle, wild animals and horses.
Remain alert and drive at a speed that allows you to respond safely.
04 | Direction and information signs
The background colour of a rectangular sign can provide useful clues about the type of route or information being displayed.
Blue backgrounds are used for motorway direction signs.
Blue rectangular signs are also used for certain other information signs away from motorways.
Always consider the symbol, wording and road context rather than relying on colour alone.
Green backgrounds are used for direction signs on primary routes.
These signs may include coloured panels showing routes of other classifications.
White backgrounds are commonly used for direction signs on non-primary routes.
White panels may also appear with regulatory or warning signs to provide additional information.
Brown signs commonly indicate tourist attractions, destinations or facilities.
The information and symbols help identify the type of attraction or facility.
05 | Speed limits and restrictions
Speed limits vary according to the road, location and type of vehicle. Signs and other legal rules determine the limit that applies.
No. The national speed limit depends on the road type and the class of vehicle being driven.
Different limits can apply to cars, goods vehicles, buses and vehicles towing trailers.
The national speed limit sign does not mean every vehicle may travel at 70 mph.
No. In England and Scotland, qualifying restricted roads with street lighting generally have a 30 mph limit unless signs or other provisions indicate otherwise.
In Wales, qualifying restricted roads generally have a 20 mph limit unless a different limit applies.
Not every road with street lighting is legally a restricted road. Check the applicable rules and signage.
Repeater signs remind drivers of a speed limit already in force.
Whether repeaters are used depends on the road and signing requirements.
A lack of repeater signs does not automatically mean a speed limit has ended.
Some signs restrict vehicles by height, width, length, weight or vehicle type.
A restriction may affect whether your vehicle can legally or safely use a route.
Drivers should know their vehicle's dimensions and relevant weights and follow applicable restrictions.
06 | Roadworks and motorway signs
Temporary signs, lane controls and motorway instructions can require drivers to change speed, lane or route.
Temporary roadworks signs can give legally enforceable instructions or warn of changed road conditions.
Follow applicable temporary speed limits, lane restrictions, signals and directions.
Orange or yellow roadworks-related signs and temporary layouts may require additional attention.
A red X means the lane is closed.
You must not drive in a lane displaying a red X.
Follow the displayed lane-control signals and move into an available lane safely.
A speed limit displayed in the prescribed red circular sign on an electronic motorway signal is legally enforceable.
Some other displayed speeds are advisory. Drivers must distinguish between mandatory and advisory signs.
Lane arrows and direction signs can help you choose the correct lane before a junction or exit.
Plan lane changes in good time and only move when safe.
Never make a sudden or unsafe manoeuvre because you've missed a turning.
07 | Interactive knowledge check
Test your knowledge with three everyday situations. Choose an answer and open the dropdown to find out whether you were right.
These examples are educational exercises, not a substitute for official road signs or driving instruction.
You see a circular sign with a red border displaying 40.
A red-bordered circular speed sign indicates a maximum speed limit, not a recommended speed.
You must not exceed the applicable 40 mph limit.
You may need to drive slower when conditions require it.
Minimum-speed signs have a different design and appearance.
You approach a triangular sign with a red border warning of a sharp bend.
Warning signs alert you to potential hazards or changes in road conditions.
Adjust your driving to the circumstances.
A warning triangle does not automatically mean a road is closed.
A warning sign does not automatically change the legal speed limit.
An overhead motorway signal displays a red X above the lane ahead.
A red X indicates that the lane is closed.
You must not drive in that lane.
Follow lane-control signals and leave the closed lane safely.
Do not make abrupt or dangerous movements.
The red X indicates a closed lane, not an instruction to stop beneath the signal.
Follow the applicable signs and move to an open lane safely.
08 | Frequently misunderstood signs
No. The permitted maximum depends on road type and vehicle class.
For example, the national speed limit for a car may differ from that for a heavier goods vehicle or a vehicle towing a trailer.
A warning sign does not ordinarily create a new speed limit on its own.
However, drivers must still travel at a speed appropriate to the circumstances and obey all applicable requirements.
No. Blue circular signs generally give positive instructions or indicate routes restricted to certain traffic.
Blue rectangular signs are more commonly associated with information or motorway directions.
Supplementary plates can qualify the main sign by showing times, distances, vehicle types or other restrictions.
Always read the complete sign, including any additional plates.
Most Great Britain traffic signs follow a common system, but there can be regional differences.
Wales uses some bilingual signs and has different default speed-limit arrangements for qualifying restricted roads.
Northern Ireland has separate legislation and official road-user guidance.
09 | Official information
The Department for Transport and the Highway Code provide detailed information and official illustrations of road signs used in Great Britain.
Explore signs giving orders, warning signs, direction signs, information signs and roadworks signs.
View official Highway Code road signsA detailed official reference explaining the signing system and common road signs.
Explore Know Your Traffic SignsLearn how speed-limit signs, national limits and repeaters are used.
View official speed-limit guidanceRead more about signs giving orders and common hazard warnings.
View official regulatory signs