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Dual carriageways
Dual carriageways often have higher speed limits than other roads.
To allow for this faster-moving traffic, dual carriageways have two or more lanes in each direction. Traffic moving in opposite directions is separated by a central reservation; this sometimes has a crash barrier to protect the streams of traffic from one another.
Most dual carriageways are clearways (but not all clearways are dual carriageways). Clearways are roads on which you are not allowed to stop; stationary vehicles would pose extreme danger to fast-moving traffic.
Although the average speed on dual carriageways is higher than on other roads (with the possible exception of motorways) you will still have to to deal with hazards that you find on smaller two-way roads, such as cyclists, slow vehicles, traffic lights, crossroads, side turnings, gateways, etc. This means that you must exercise special care, especially when joining and leaving dual carriageways.
Dual carriageways
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