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Alternative Title:Variable Speed Limit ¿ Best Management Practice [Summary]
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Edition:Summary.
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NTL Classification:NTL-SAFETY AND SECURITY-Speed Limits
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Abstract:In variable speed limit (VSL) zones, the speed
limit changes in response to traffic congestion,
adverse weather, or road conditions. VSL zones are
often highly automated and have been employed
successfully in several U.S. and European
locations. Dynamic signs display the current speed
limit, adjusted according to a specific set of rules
and based on data transmitted from highway
sensors. Sometimes, VSL signs are paired with
signs that inform drivers about road conditions or
minimum speed. Ideally, approaching traffic will
slow down and pass through the problem area at a
slower but more consistent speed, reducing stopand-
go traffic. This also reduces the probability of
an accident by giving drivers more time to react
to changing road conditions and helping them
avoid the need to brake sharply as they approach
congestion.
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