Left-Turn Accommodations at Unsignalized Intersections (2013) / Chapter Skim
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Pages 3-4
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3 Background of Study Left-turn movements at unsignalized intersections, including driveways -- especially movements that are made from lanes that are shared with through traffic -- cause delays and adversely impact safety. The warrants used by many jurisdictions for when to provide left-turn lanes are based on volume thresholds and a queuing model introduced in research from the mid-1960s.
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From page 4... ...
4• Potential of signalizing the intersection in the foreseeable future. Proper consideration of these issues, and the ability to make informed decisions about them, will improve the likelihood that a left-turn lane is installed at an appropriate location and that its design will lead to improved operations during its service life.
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