Single carriageway
（重定向自Undivided highway）
![The A511 in Leicestershire, England: a typical single-carriageway arterial road with one traffic lane for each direction (and, in this case, a two-way pedestrian and cycle way alongside)](/Images/godic/202502/18/A511road0041417.JPG")
![Diagram of types of road in the UK](/Images/godic/202502/18/Uk_carriageway_guide1417.png")
![](/Images/godic/202502/18/High_Five1417.jpg")
A single carriageway (North American English undivided highway) is a road with one, two 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.