Masters Theses


"This study proposes a method for calibration of speed-flow curves in a format suggested by the Highway Capacity Manual (HCM) 2010 and applies it to two sites in Missouri: a work zone on I-44 around Pacific, and a basic freeway segment on I-270 in St. Louis. The three-regime model proposed is based on the two-regime (free-flow and transition) uncongested relationship suggested by the HCM 2010, complemented with a third regime representing congested conditions. Further, this study proposes a systematic approach based on regression analysis to determine capacity i.e., the break-point (intersection) between the transition and congested regimes. The proposed method estimated the capacity of the work zone site to be 1680 pc/h/ln, reasonably close to the value suggested by the HCM 2010 for a site with such characteristics (1600 pc/h/ln). The method was also successful in estimating the capacity of the freeway site with respect to the HCM 20 I 0 recommended value; the estimated capacity was around 2140 pc/h!ln, only slightly lower than the HCM recommended capacity of around 2230 pc/h/ln, for a site with respective free-flow speed. The capacity was, however, reached at a density (around 37 pc/h/ln) much lower than the HCM recommended value (45 pc/h/ln). Although the HCM 2010 generic curves for basic freeway segment are useful in absence of field data, a systematic approach such as the one presented in this study, is necessary in order to have a more accurate estimate of capacity at a specific site"--Abstract, page iii.


Bham, Ghulam

Committee Member(s)

Samaranayake, V. A.
Leu, M. C. (Ming-Chuan)


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


Missouri University of Science and Technology

Publication Date

Fall 2011


vii, 30 pages

Note about bibliography

Includes bibliographical references (pages 28-29).

Geographic Coverage

Pacific (Mo.)
Saint Louis (Mo.)


© 2011 Seyed Hadi Khazraee Khoshroozi, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Curves in engineering
Highway capacity -- Planning
Roads -- Design and construction -- Safety measures -- Missouri
Traffic speed

Thesis Number

T 9931

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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