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A dual carriageway or a divided highway is a class of highway with carriageways for traffic travelling in opposite directions separated by a central reservation (BrE) or median (AmE). Roads with two or more carriageways which are designed to higher standards with controlled access are generally classed as motorways , freeways, etc., rather than ...
A dual carriageway road (North American English: divided highway) has two roadways separated by a central reservation (North American English: median). A local-express lane system (also called collector-express or collector-distributor) has more than two roadways, typically two sets of 'local lanes' or 'collector lanes' and also two sets of ...
An undivided highway (American English) is the term used for motorways with two or more lanes with no central reservation/median strip. Road traffic safety is generally worse for high-speed single carriageways than for dual carriageways due to the lack of separation between traffic moving in opposing directions.
The Plimoth Patuxet Highway in Massachusetts is a two-lane divided freeway. A controlled access highway may be two lanes known as a two-lane expressway. They are often undivided, are sometimes built when traffic volumes are low (but may be upgraded later), right-of-way is limited or due to low funding.
A highway that splits off the mainline and reconnects some distance later. Ambulance A medically equipped vehicle which transports patients to treatment facilities, such as hospitals. Annual average daily traffic (AADT) A measure of total volume of vehicle traffic on a segment of road for a year divided by 365 days to produce an average.
The Veterans Memorial Parkway in London, Ontario is a modern at-grade limited-access road with intersections. A limited-access road, known by various terms worldwide, including limited-access highway, dual-carriageway, expressway, and partial controlled-access highway, is a highway or arterial road for high-speed traffic which has many or most characteristics of a controlled-access highway ...
This stretch of highway has a guard rail that acts as a median barrier. Route 88, a two-lane expressway in Westport connecting Interstate 195, US 6, and Route 177 to Horseneck Beach. Unlike the other examples in Massachusetts, Route 88 features a mixture of interchanges and signaled intersections, and divided and undivided status.
Bundesautobahn 9 near by Garching bei Muenchen, Germany. At the top of the hierarchy in terms of traffic flow and speed are controlled-access highways; their defining characteristic is the control of access to and from the road, meaning that the road cannot be directly accessed from properties or other roads, but only from specific connector roads.