Three Lane Highways
Many three lane roads were built in previous years and are still in use. Their great advantages seemed to stem from an operational improvement over the two lane road, with only a moderate increase in construction and right of way costs. The center lane is either used as two way center left turn lane or alternates in the uphill direction as a directional passing lane. The three lane road does appear to have a high accident rate, and construction of these types of roads is no longer recommended except in special cases.
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pict source : www.northeastroads.com
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pict source : www.highways.gov.uk
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pict source : www.advrider.com
Highway and Transport Engineering
and this section is about Design of intersection
(refference : Wright, P.H, with contributions by James S. Lai, Peter S.Parsonson, Michael Meyer., Highway Engineering, 6th edition ,John Wiley & Sons, Inc.New York, 1996.)
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