Missouri Work Zone Capacity: Results of Field Data Analysis [TPF-5-(081)]

Bham, Ghulam H.; Khazraee, S. Hadi; Missouri University of Science and Technology. Department of Civil, Architectural, and Environmental Engineering

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Missouri Work Zone Capacity: Results of Field Data Analysis [TPF-5-(081)]

2011-06-01
By Bham, Ghulam H. ; Khazraee, S. Hadi

[PDF-1.74 MB]

English

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Creators:

Bham, Ghulam H. ; Khazraee, S. Hadi

Bham, Ghulam H. ; Khazraee, S. Hadi Less -
Corporate Creators:

Missouri University of Science and Technology. Department of Civil, Architectural, and Environmental Engineering
Subject/TRT Terms:

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Field Tests Highway Capacity Interstate Highways Traffic Congestion Traffic Flow Rate Traffic Queuing Work Zones
Publication/ Report Number:

TPF-5-(081) & DOT #09810
Resource Type:

Tech Report
Geographical Coverage:

Missouri
Corporate Publisher:

Missouri University of Science and Technology. Dept. of Civil, Architectural, and Environmental Engineering
Abstract:

This report presents the results of work zone field data analyzed on interstate highways in Missouri to determine the mean breakdown and queue-discharge flow rates as measures of capacity. Several days of traffic data collected at a work zone near Pacific, Missouri with a speed limit of 50 mph were analyzed in both the eastbound and westbound directions. As a result, a total of eleven breakdown events were identified using average speed profiles. The traffic flows prior to and after the onset of congestion were studied. Breakdown flow rates ranged between 1194 to 1404 vphpl, with an average of 1295 vphpl, and a mean queue discharge rate of 1072 vphpl was determined. Mean queue discharge, as used by the Highway Capacity Manual 2000 (HCM), in terms of pcphpl was found to be 1199, well below the HCM’s average capacity of 1600 pcphpl. This reduced capacity found at the site is attributable mainly to narrower lane width and higher percentage of heavy vehicles, around 25%, in the traffic stream. The difference found between mean breakdown flow (1295 vphpl) and queue-discharge flow (1072 vphpl) has been observed widely, and is due to reduced traffic flow once traffic breaks down and queues start to form. The Missouri DOT currently uses a spreadsheet for work zone planning applications that assumes the same values of breakdown and mean queue discharge flow rates. This study proposes that breakdown flow rates should be used to forecast the onset of congestion, whereas mean queue discharge flow rates should be used to estimate delays under congested conditions. Hence, it is recommended that the spreadsheet be refined accordingly.
Format:

PDF
Funding:

25-1121-0001-118
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:2ff1a527844fe6051fd49d5a830205fbb2ae9d721330885a94553eed076b18bf
Download URL:

https://rosap.ntl.bts.gov/view/dot/26351/dot_26351_DS1.pdf
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Missouri Work Zone Capacity: Results of Field Data Analysis [TPF-5-(081)]

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