United States Department of Transportation
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Development of Planning Values for Urban Freeways in Large Texas Cities
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1989-11-01
[PDF-2.60 MB]
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Edition:Final Report September 1987 - November 1989
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Abstract:Using data from automatic traffic recorders (ATR) for the years 1973 to 1988 in the Texas cities of Houston, Dallas, Fort Worth, Austin, and San Antonio, this project has studied the planning parameters K and D used to determine design hour volumes. Truck percentages during peak hours have been studied using data from 24-hour manual count stations from 1984 through 1987. Variables identified and tested for significance in predicting directional K factors (Kd) included weekday ADT per lane, degree of capacity utilization during the peak hour, employment density near the ATR station, length of peak period, and distance from the CBD. Although correlations were found using individual variables, a multivariable regression and analysis produced a highly unstable model over time.
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