A dual-carriageway is a road where traffic travelling in opposite directions is separated by:
A physical central reservation
A single solid white line
Double white lines
Traffic islands every 100 metres
Dual-carriageways are often Clearways. A clearway is a road:
Where you are not permitted to stop
Where you are only allowed to stop to set down passengers
That has a 70 mph speed limit
With a central reservation
You might have to drive on a dual-carriageway during your driving test.
You will often join a dual-carriageway from an acceleration lane. An acceleration lane is:
A lane for overtaking
An extra lane on the left where you can build up your speed
A lane with a minimum speed limit of 60 mph
A lane reserved for high powered vehicles
When leaving a high-speed dual-carriageway via a slip road you should always check your speedometer. This is because:
You must avoid holding up traffic behind
You might be going faster than you think
You might be going slower than you think
You have to keep up to the speed limit
If you break down on a dual carriageway you should turn on your hazard warning lights and use a warning triangle to warn other drivers.