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Title:

Operational Impacts of Auxiliary Lanes at Freeway Weaving Segments

Accession Number:

01520129

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

A two-part study was conducted to assess the operational impacts of auxiliary lanes at freeway weaving segments. The first part of the study evaluated the improvements in traffic density and level of service at freeway segments before and after the addition of an auxiliary lane. The second part of the study developed recommendations on when to add auxiliary lanes at these freeway segments. The analyses were performed with the 2010 Edition of the Highway Capacity Software, which follows the procedure prescribed in Chapter 12 and 13 of the 2010 Edition of the Highway Capacity Manual. The 2010 Edition of the Highway Capacity Software was validated with field data collected at three freeway weaving segments in El Paso, Texas, prior to the analysis. The results show that adding an auxiliary lane at a freeway segment between on-ramp and off-ramp junctions reduces the traffic density in a range from 1.6 to 19.5 pc/mi/ln, or 4% to 50%, with the level service stays the same or improved. Higher improvements are obtained with shorter segment lengths combined with higher weaving volumes. This research has also developed charts which contain recommendations on when to include auxiliary lanes under different combinations of freeway volume, weaving volume and distance between the on-ramp and off-ramp.

Supplemental Notes:

This paper was sponsored by TRB committee AHB40 Highway Capacity and Quality of Service.

Monograph Accession #:

01503729

Report/Paper Numbers:

14-0681

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Wang, Yubian
Cheu, Ruey Long
Qi, Yi
Chen, Xiaoming

Pagination:

16p

Publication Date:

2014

Conference:

Transportation Research Board 93rd Annual Meeting

Location: Washington DC
Date: 2014-1-12 to 2014-1-16
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Identifier Terms:

Highway Capacity Software

Geographic Terms:

El Paso (Texas)

Subject Areas:

Highways; Operations and Traffic Management; I72: Traffic and Transport Planning

Source Data:

Transportation Research Board Annual Meeting 2014 Paper #14-0681

Files:

TRIS, TRB, ATRI

Created Date:

Jan 27 2014 2:18PM