A carriageway (British English) or roadway (North American English) is a width of road on which a vehicle is not restricted by any physical barriers or separation to move laterally. A carriageway generally consists of a number of traffic lanes together with any associated shoulder, but may be a sole lane in width (for example, a highway offramp).
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👉 Carriageway in the context of Concurrency (road)
In a road network, a concurrency is an instance of one physical roadway bearing two or more different route numbers. The practice is often economically and practically advantageous when multiple routes must pass between a single mountain crossing or over a bridge, or through a major city, and can be accommodated by a single right-of-way. Each route number is typically posted on highways signs where concurrencies are allowed, while some jurisdictions simplify signage by posting one priority route number on highway signs. In the latter circumstance, other route numbers disappear when the concurrency begins and reappear when it ends. In most cases, each route in a concurrency is recognized by maps and atlases.
In this Dossier
- ⭐ Core Definition: Carriageway
- 👉 Carriageway in the context of Concurrency (road)
- Carriageway in the context of Sidewalks
- Carriageway in the context of Dual carriageway
- Carriageway in the context of Local-express lanes
- Carriageway in the context of Single carriageway
- Carriageway in the context of Protected intersection
- Carriageway in the context of Unter den Linden
Carriageway in the context of Sidewalks
A sidewalk (North American English), pavement (British English, South African English), or footpath (Irish English, Indian English, Australian English, New Zealand English) is a path along the side of a road. Usually constructed of concrete, pavers, brick, stone, or asphalt, it is designed for pedestrians. A sidewalk is normally higher than the roadway, and separated from it by a curb. There may also be a planted strip between the sidewalk and the roadway and between the roadway and the adjacent land.
Carriageway in the context of Dual carriageway
A dual carriageway (BrE) or a divided highway (AmE) 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 dual carriageways.
A road without a central reservation is known as a single carriageway regardless of how many lanes there are. Dual carriageways have improved road traffic safety over the years and over single carriageways and typically have higher speed limits as a result. In some places, express lanes and local or collector lanes are used within a local-express-lane system to provide more capacity and to smooth out traffic flows for longer-distance travel.
Carriageway in the context of Local-express lanes
The local–express lane system is an arrangement of carriageways within a major highway where long distance traffic can use inner express lanes with fewer interchanges compared to local traffic which use outer local lanes that have access to all interchanges. This can also be called a collector/distributor lane system within a single interchange. One of the longest examples is Highway 401 in Toronto, where highway ramps between express and local lanes cross over one another; these are commonly known as braided ramps and in Toronto as a basketweave.
Some places may have only three carriageways on the highway instead of four, utilizing one directional express lanes. They may be permanent, or they can be reversible express lanes such as in Seattle where they alternate direction.
Carriageway in the context of Single carriageway
A single carriageway (British English) is a road with one, two or more lanes arranged within a one carriageway with no central reservation/median strip to separate opposing flows of traffic. A single-track road is a type of single carriageway with a single lane with passing places for traffic in both directions. 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.
Carriageway in the context of Protected intersection
A protected intersection or protected junction, also known as a Dutch-style junction, is a type of at-grade road junction in which cyclists and pedestrians are separated from cars. The primary aim of junction protection is to help pedestrians and cyclists be and feel safer at road junctions.
At a conventional junction, pedestrians are separated from motor vehicles, while cyclists are placed in the carriageway with motorists. Cycle lanes are often placed on the nearside (right in right-side driving countries; left in left-side countries) of the carriageway, which can create conflict, for example when a cyclist is going straight ahead and a motorist is turning to the nearside.
Carriageway in the context of Unter den Linden
Unter den Linden (German: [ˈʊntɐ deːn ˈlɪndn̩] , "under the linden trees") is a boulevard in the central Mitte district of Berlin, Germany. Running from the Berlin Palace to the Brandenburg Gate, it is named after the linden trees (known as lime in the UK and Ireland and basswood in North America, not related to citrus lime) that line the grassed pedestrian mall on the median and the two broad carriageways. The avenue links numerous Berlin sights, landmarks and rivers for sightseeing.