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Project Details
STATUS

In-Progress

START DATE

07/08/14

END DATE

06/23/16

RESEARCH CENTERS InTrans, CTRE
SPONSORS

Federal Highway Administration Office of Safety

PARTNERS

sub to Leidos

Researchers
Principal Investigator
Shauna Hallmark

Director, InTrans

About the research

The purpose of this task is to provide the Federal Highway Administration (FHWA) Roadway Departure Team with technical support to gather the necessary information and develop appropriate outreach materials for a wide range of audiences on curve delineation treatments. The objective is to achieve positive results in decreasing roadway fatalities and reducing the number of injuries due to crashes when vehicles leave their lane of travel on a horizontal curve.

This project is a subcontract with LEIDOS.

Project Details
STATUS

Completed

START DATE

09/13/12

END DATE

12/31/14

RESEARCH CENTERS InTrans, CTRE
SPONSORS

Federal Highway Administration Office of Safety

Researchers
Principal Investigator
Keith Knapp

Director, LTAP

About the research

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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