Guidelines for the conversion of urban four-lane undivided roadways to three-lane two-way left-turn lane facilities

Knapp, Keith K.; Giese, Karen

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Guidelines for the conversion of urban four-lane undivided roadways to three-lane two-way left-turn lane facilities

2001-04-01
By Knapp, Keith K. ; Giese, Karen

[PDF-625.30 KB]

English

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Creators:

Knapp, Keith K. ; Giese, Karen

Knapp, Keith K. ; Giese, Karen Less -
Corporate Contributors:

Iowa State University. Center for Transportation Research and Education ; Iowa. Dept. of Transportation

Iowa State University. Center for Transportation Research and Education ; Iowa. Dept. of Transportation Less -
Subject/TRT Terms:

[+]

Alternatives Analysis Arterial Highways Before And After Studies Four Lane Highways Highway Safety Iowa Level Of Service Research Roadway Conversions Sensitivity Analysis Simulation Software Three Lane Highways Traffic Flow Traffic Volume Two Way Left Turn Lanes
Resource Type:

Tech Report
Geographical Coverage:

Iowa
Corporate Publisher:

Iowa State University. Center for Transportation Research and Education
Abstract:

The primary objective of this research project was to develop a set of guidelines to assist in the selection of candidate roadways for urban four-lane undivided to three-lane cross section conversions. The authors evaluated and assessed the physical, operational, and safety characteristics that appear to be compatible with the consideration and/or feasibility of this type of conversion. These characteristics were evaluated qualitatively, with simulation software, and through an interpretation of subjective and objective before-and-after study results from four-lane undivided to three-lane conversions throughout the United States and Iowa. Some of the roadway characteristics investigated were roadway function and environment, overall traffic volume and level of service, turning volumes and patterns, weaving/speed/queues, crash types and patterns, pedestrian and bicycle activity, right-of-way availability/cost/acquisition, and several other general characteristics (e.g., parallel parking).
Format:

PDF
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:bd8da5a372a6a3ba04b982d09828e567bed8da01fe5ba3d0b6180059556c38d4
Download URL:

https://rosap.ntl.bts.gov/view/dot/14499/dot_14499_DS1.pdf
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Guidelines for the conversion of urban four-lane undivided roadways to three-lane two-way left-turn lane facilities

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