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Intersection sight distance is the sight distance needed to safely proceed through an intersection. The distance needed depends on the type of traffic control at the intersection (uncontrolled, yield sign, stop sign or signal), and the maneuver (left turn, right turn, or proceeding straight).
[9]: 431–433 Another benefit of all-way stops is assurance that vehicles enter the intersection at a low speed and have more time to take heed of the traffic situation, [9]: 430 especially useful when sight distance is highly restricted. Some of the disadvantages associated with all-way stops are: Increased emissions of hydrocarbons.
Curb extensions can provide daylighting. Intersection daylighting, or simply daylighting, is an urban design strategy to enhance safety at intersections by improving visibility.
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The design sight distance allows a below-average driver to stop in time to avoid a collision in most cases. Driver perception/reaction distance is calculated by: d PRT = 0.278 Vt (metric) d PRT = 1.47 Vt (US customary) Where: d PRT = driver perception-reaction distance, m (ft) V = design speed, km/h (mph) t = brake reaction time, in seconds
One way to classify intersections is by the number of road segments (arms) that are involved. A three-way intersection is a junction between three road segments (arms): a T junction when two arms form one road, or a Y junction, the latter also known as a fork if approached from the stem of the Y.
A graphical representation of phase state on a two-axis plane of distance versus time clearly shows a "green band" that has been established based on signalized intersection spacing and expected vehicle speeds. [15] In some countries (e.g. Germany, France and the Netherlands), this "green band" system is used to limit speeds in certain areas ...
Straight-line diagrams were historically used in transportation planning but have been supplanted for these purposes by geographic information systems. [ 1 ] A strip map is a road map laid out similarly to a straight-line diagram, featuring the same details found in more conventional road maps rather than technical details.