A rectangular blue sign depicting a dual-carriageway symbol over a bridge indicates the formal start of a motorway.
Passing this sign means general traffic rules are immediately replaced by special motorway regulations set out in the Highway Code.
What this sign means
This sign marks the transition point onto a motorway carriageway or slip road.
From this point onward, specific motor vehicle restrictions, high-speed lane rules, and non-stopping clearway laws apply.
- Blue background: Indicates motorway regulations apply.
- Prohibited users: L-drivers (unless with ADI in dual-control car), pedestrians, cyclists, learner motorcyclists, and agricultural vehicles.
What to do when you see it
Match your speed smoothly to joining motorway traffic on the slip road.
Ensure your vehicle is legal for motorway travel and maintain proper lane discipline once merged.
How this sign is tested
Theory tests test identification of prohibited road users and speed limits applicable past the motorway start sign.
Candidates are evaluated on understanding slip road joining procedures and general motorway laws.
Common mistakes
Failing to know which road users are legally banned from entering motorways.
Confusing standard primary route directional signs (green) with blue motorway entrance signs.
Test yourself on this one
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Practise road sign questionsFrequently asked questions
Can learner drivers drive past this sign?
Learner car drivers may only drive on motorways in England, Scotland, and Wales accompanied by an Approved Driving Instructor in a dual-control vehicle.
What is the general national speed limit past this sign?
The national speed limit for cars and motorcycles on motorways is 70 mph unless lower variable limits apply.
Are U-turns permitted beyond the motorway start sign?
No, U-turns, reversing, or driving against traffic flow on motorways are strictly illegal.