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A detour or (
Depending on the roadway affected, and the scope of construction, different types of detours may be used. The most basic is to simply close a stretch of roadway for a defined period of time, diverting all traffic around the site. Other types of detours may also be used, such as a detour that is only in effect at night, only in effect during weekends, or a detour that restricts through traffic while permitting local traffic such as residents and delivery vehicles. Which type of detour to use is decided by a variety of factors – a full closure of a road means construction can be completed more quickly, but also means a more severe impact on traffic.
Detours may be used for 
In North America, the various railroad companies have agreed to cooperate when one company needs to detour its trains onto the tracks of a different company. The railroad detouring trains will arrange with the "host" railroad(s) how many trains a day will need to use a detour, and agree on the fee per train-mile the detouring company will pay in exchange.
A detour or (British English
British English (BrE, en-GB, or BE) is, according to Lexico, Oxford Dictionaries, "English language, English as used in Great Britain, as distinct from that used elsewhere". More narrowly, it can refer specifically to the English language in ...
: diversion) is a (normally temporary) route taking traffic around an area of prohibited or reduced access, such as a construction
Construction is a general term meaning the art and science to form objects, systems, or organizations,"Construction" def. 1.a. 1.b. and 1.c. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) Oxford University Press 2009 and com ...
site. Standard operating procedure for many roads departments is to route any detour over roads within the same jurisdiction as the road with the obstructed area.
On multi-lane highway
A highway is any public or private road or other public way on land. It is used for major roads, but also includes other public roads and public tracks. In some areas of the United States, it is used as an equivalent term to controlled-access ...
s (e.g., freeways
A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway and expressway. Other similar terms i ...
, expressways
Expressway may refer to:
*Controlled-access highway, the highest-grade type of highway with access ramps, lane markings, etc., for high-speed traffic.
*Limited-access road, a lower grade of highway or arterial road.
*Expressway, the fictional slide ...
, city streets, etc.), usually traffic shifts can replace a detour, as detours often congest turn lanes.
Types
Depending on the roadway affected, and the scope of construction, different types of detours may be used. The most basic is to simply close a stretch of roadway for a defined period of time, diverting all traffic around the site. Other types of detours may also be used, such as a detour that is only in effect at night, only in effect during weekends, or a detour that restricts through traffic while permitting local traffic such as residents and delivery vehicles. Which type of detour to use is decided by a variety of factors – a full closure of a road means construction can be completed more quickly, but also means a more severe impact on traffic.
Implementation
Detours require signage to notify drivers, especially those who are not local and are unfamiliar with the road network in an area. Creating a detour imposes costs on motorists, along with wear and tear on the detour route. When a detour from a highway travels over local streets, they may first be reinforced to handle highway level traffic.Railroad detours
Detours may be used for train
In rail transport, a train (from Old French , from Latin , "to pull, to draw") is a series of connected vehicles that run along a railway track and Passenger train, transport people or Rail freight transport, freight. Trains are typically pul ...
s as well. Implementing detours is more difficult for railroads, as rail networks do not have the many redundant pathways offered by road networks. Railroad detours are most commonly used when a significant natural disaster renders a railroad route inaccessible until it can be repaired, though they may also be used when a line is out of service for maintenance.In North America, the various railroad companies have agreed to cooperate when one company needs to detour its trains onto the tracks of a different company. The railroad detouring trains will arrange with the "host" railroad(s) how many trains a day will need to use a detour, and agree on the fee per train-mile the detouring company will pay in exchange.
Permanently signed detour routes
References
{{Reflist Road transport