Single carriageway

Single Carriageway

Single carriageway

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A single carriageway (North American English undivided highway) is a road with 1, 2 or more lanes arranged within a single carriageway (North American English: roadway) with no central reservation (North American English: median) to separate opposing flows of traffic. Two-lane road or two-lane highway are single carriageway with one lane for each direction. A single track road has a a single lane with passing places for traffic in both directions. Road traffic safety is generally worse for high-speed single carriageway roads than for dual carriageway (North America English: divided highways) due to the lack of separation between traffic moving in opposing directions.


The term single carriageway is used for roads in the Republic of Ireland. Speed limits on single carriageway roads vary depending on their classification: national primary roads and national secondary roads have a general speed limit of while regional roads and local roads have a general speed limit of . In urban areas, the general speed limit is .

United Kingdom

The maximum UK speed limit for single carriageway roads is lower than the maximum for dual-carriageway roads. The 'national speed limit', which is lower for built-up areas, only applies in places where a lower numeric speed limit is not in place. The UK has one major single carriageway motorway, the A38, but a number of link roads at motorway interchanges are single carriageway.

United States

In the U.S. the expression "undivided...
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