United States Department of Transportation
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Road diet informational guide.
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2014-11-01
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[PDF-1.89 MB]
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Abstract:A classic Road Diet converts an existing four-lane undivided roadway segment to a three-lane segment consisting of two
through lanes and a center two-way left turn lane (TWLTL). A Road Diet improves safety by including a protected left-turn lane
for mid-block left-turning motorists, reducing crossing distance for pedestrians, and reducing travel speeds that decrease crash
severity. Additionally, the Road Diet provides an opportunity to allocate excess roadway width to other purposes, including
bicycle lanes, on-street parking, or transit stops. This Informational Guide includes safety, operational, and quality of life considerations
from research and practice, and guides readers through the decision-making process to determine if Road Diets are
a good fit for a certain corridor. It also provides design guidance and encourages post-implementation evaluation.
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