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A geometric design saved on construction costs and improved visibility with the intention to reduce the likelihood of traffic incidents. The geometric design of roads is the branch of highway engineering concerned with the positioning of the physical elements of the roadway according to standards and constraints. The basic objectives in ...
An acceleration lane or merge lane allows traffic entering a highway to accelerate to the speed of through traffic before merging with it. A deceleration lane is a lane adjacent to the primary road or street used to improve traffic safety [ citation needed ] by allowing drivers to pull out of the through lane and decelerate before turning off a ...
However, dynamic elements are now being introduced into road traffic management. Dynamic elements have long been used in rail transport. These include sensors to measure traffic flows and automatic, interconnected, guidance systems to manage traffic (for example, traffic signs which open a lane in different directions depending on the time of day).
A right-turn slip lane in the United States (center of photo), including a pedestrian crossing. In countries such as the United Kingdom in which partial conflicts between pedestrians and vehicular traffic are not permitted, slip lanes can be used as part of a "walk with traffic" facility. Normally, pedestrian signals in the UK operate on a full ...
See three-way junction 5-1-1 A transportation and traffic information telephone hotline in some regions of the United States and Canada that was initially designated for road weather information. A Access road See frontage road Advisory speed limit A speed recommendation by a governing body. All-way stop or four-way stop An intersection system where traffic approaching it from all directions ...
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 'express lanes'. "Cars only" lanes may be physically separated from those open to mixed traffic including trucks and buses.
Marohn distinguishes between roads that are designed for mobility which he terms "roads" and those that function to "build a place", build community wealth and provide access to land. He argues the value of a road in terms of both community wealth and mobility is maximised when the road speed is either low or high, but not at midpoints such as ...
Traffic entrance and exit is performed at interchanges only. Motorways have no access for traffic between interchanges and do not provide access to adjacent land. Motorways are especially sign-posted; Motorways status is signaled at the entry and exit of the motorway by a symbol conforming to international agreements, but specific to each ...