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DUAL CARRIAGEWAY
Build your confidence on dual carriageways.
Dual carriageways require faster speeds, more forward planning and confident lane discipline. Our complete guide covers everything from speed limits to safe overtaking.
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What is a dual carriageway?
A dual carriageway is a road where the two directions of traffic are separated by a central reservation. Unlike motorways, dual carriageways may have roundabouts, traffic lights, pedestrian crossings and access to driveways and minor roads. The national speed limit on a dual carriageway is 70 mph, although lower limits may apply in certain areas.
Key rules for dual carriageways
Keep left unless overtaking. When overtaking, check your mirrors, signal, move into the right lane, complete the overtake and return to the left lane as soon as it is safe. Do not travel in the right lane unnecessarily — middle-lane hogging is a careless driving offence that can result in a fixed penalty.
Lane Discipline
Keep left unless overtaking. Return to the left lane as soon as possible after passing a slower vehicle.
Joining & Leaving
Use the slip road to match your speed to traffic before merging. Signal and check blind spots before joining.
Speed Limits
The national speed limit on a dual carriageway is 70 mph. Look out for variable or reduced limits, especially in roadworks.
Overtaking Safely
Only overtake if there is a clear gap and you can complete the manoeuvre without cutting in. Never overtake on the left except in slow-moving queues.
Roundabouts
Dual carriageways often end at a roundabout. Approach in the correct lane and signal appropriately for your exit.
Road Markings
Hatched markings separate traffic — if bordered by a broken line, enter only if necessary and safe; if solid, do not enter.
Joining a dual carriageway
Use the slip road to build up speed to match traffic on the carriageway. Signal right as you approach the end of the slip road, check your mirrors and blind spot, and merge when there is a safe gap. Do not stop at the end of the slip road unless traffic makes it impossible to merge — yield to traffic on the main carriageway rather than forcing vehicles to brake for you.
Gain dual carriageway confidence with RED
Our instructors will take you on dual carriageways as part of your training to build real-world confidence.
Dual Carriageway FAQs
What is the speed limit on a dual carriageway?
Can learners drive on dual carriageways?
Is middle-lane hogging illegal?
What is the difference between a dual carriageway and a motorway?
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