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Abstract

The influence of trucks on highway performance has always been of interest. However, planning studies today tend to assume that a certain percentage of the traffic stream is trucks (e.g., 5%) and to make adjustments accordingly. The Highway Capacity Manual (HCM) converts trucks into passenger car equivalents by using a passenger car equivalent factor. For the HCM, however, this situation is changing. This paper describes changes to the basic freeway section methodology that are being developed to better address truck-related issues. Specifically, new models predict the space mean speeds of autos and trucks in mixed traffic streams for a variety of road grades. Also presented is a capacity adjustment factor that allows conversion of capacity values for auto-only conditions to be transformed into equivalent capacity values for mixed traffic conditions. The methodologies are presented, their development is described, and examples are given to illustrate how the procedure works.

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References

Leland

, and Coleman

A General Traffic Flow Simulation Model for Freeway Operations. Bureau of Highways, Connecticut Department of Transportation, Wethersfield, and U.S. Bureau of Public Roads, 1969.

Werner

, and Morrall

J. F.

Passenger Car Equivalents of Trucks, Buses, and Recreational Vehicles for Two-Lane Rural Highways. In Transportation Research Record 615, TRB, National Research Council, Washington, D.C., 1976, pp. 10–17.

Linzer

E. M.

, Roess

R. P.

, and McShane

W. R.

Effect of Trucks, Buses, and Recreational Vehicles on Freeway Capacity and Service Volume. In Transportation Research Record 699, TRB, National Research Council, Washington, D.C., 1979, pp. 17–26.

Highway Capacity Manual. TRB, National Research Council, Washington, D.C., 2000.

Highway Capacity Manual 2010. Transportation Research Board of the National Academies, Washington, D.C., 2010.

Moving Ahead for Progress in the 21st Century (MAP-21). FHWA, U.S. Department of Transportation, 2013. http://www.fhwa.dot.gov/map21/factsheets/pm.cfm.

Dowling

, List

, Yang

, Witzke

, and Flannery

NCFRP Report 31: Incorporating Truck Analysis into the Highway Capacity Manual. Transportation Research Board of the National Academies, 2014. http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=3128.

Rakha

, Lucic

, Demarchi

, Setti

, and Van Aerde

Vehicle Dynamics Model for Predicting Maximum Truck Acceleration Levels. Journal of Transportation Engineering, Vol. 127, No. 5, 2001, pp. 418–425.

Harwood

D. W.

, Torbic

D. J.

, Richard

K. R.

, Glauz

W. D.

, and Elefteriadou

NCHRP Report 505: Review of Truck Characteristics as Factors in Roadway Design. Transportation Research Board of the National Academies, Washington, D.C., 2003.

10.

A Policy on the Geometric Design of Highways and Streets. AASHTO, Washington, D.C., 2001.

11.

Sumner

, Hill

, and Shapiro

Segment Passenger Car Equivalent Values for Cost Allocation on Urban Arterial Roads. Transportation Research Part A, Vol. 18, No. 5–6, 1984, pp. 399–406.

12.

Elefteriadou

, Torbic

, and Webster

Development of Passenger Car Equivalents for Freeways, Two-Lane Highways, and Arterials. In Transportation Research Record 1572, TRB, National Research Council, Washington, D.C., 1997, pp. 51–58.

13.

Webster

, and Elefteriadou

A Simulation Study of Truck Passenger Car Equivalents (PCE) on Basic Freeway Sections. Transportation Research Part B, Vol. 33, No. 5, 1999, pp. 323–336.

14.

Washburn

, and Ozkul

Heavy Vehicle Effects on Florida Freeways and Multilane Highways. Transportation Research Center, University of Florida, Gainesville, and Florida Department of Transportation, Tallahassee. 2013.

15.

Ahanotu

D. N.

Heavy-Duty Vehicle Weight and Horsepower Distributions: Measurement of Class-Specific Temporal and Spatial Variability, 1999. http://transaq.ce.gatech.edu/guensler/publications/theses/ahanotu%20dissertation.pdf. Accessed July 2012.

16.

Kittelson

W. K.

, Courage

K. G.

, Kyte

M. D.

, List

G. F.

, Roess

R. P.

, and Sampson

W. M.

Highway Capacity Manual Applications Guidebook. NCHRP Project 3-64 final report, Transportation Research Board of the National Academies, Washington, D.C., 2003.

On the Treatment of Trucks for Analysis of Freeway Capacity

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