Estimation of Capacity of Two-Lane Two-Way Highways Using Simulation Model
Publication: Journal of Transportation Engineering
Volume 136, Issue 1
Abstract
The Highway Capacity Manual 2000 indicates that the capacity of two-lane two-way highways (TLTWHWs) is 1,700 pcph for a single direction and 3,400 pcph for both directions. There are no capacity estimates provided for different traffic conditions such as varying percentages of no-passing zones and varying traffic distributions between the two directions of travel. Previous research has reported that capacity conditions for TLTWHW are very difficult to observe in the field while none of the existing simulation models can report capacity for TLTWHW. This paper briefly describes a new TLTWHW simulation model called TWOSIM that is developed, verified, compared to TWOPAS and highway capacity software (HCS) and used for the estimation of capacity for TLTWHW under a variety of prevailing traffic and geometric conditions. These include percentage of traffic per direction, presence of a passing zone, a horizontal curve, a driveway, an upgrade, and heavy vehicles. Capacity of TLTWHW under base conditions is estimated to be 1,800 pcphpl at 64 kph (40 mph) average free-flow speed, 2,000 pcphpl at 80 kph (50 mph), and 2,100 pcphpl at 96–112 kph (60–70 mph). The presence of passing zones was not found to have an effect on capacity. When a driveway or horizontal curve or upgrade is present, the capacity reduction ranges between 3 and 30% when there are no trucks and may reach up to 40% when trucks are present in the traffic stream.
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References
AASHTO. (2004). A policy on geometric design of highways and streets, AASHTO, Washington, D.C.
Akcelik, R. and Chung, E. (2003). “Calibration of the bunched exponential distribution of arrival headways.” Akcelic & Associates Pty.
Bonneson, J. A. (1998). “Delay to major-street through vehicles due to right turn activity.” Transp. Res., Part A, 32(2), 139–148.
Bonneson, J. A. (1999). “Side friction and speed as controls for horizontal curve design.” J. Transp. Eng., 125(6), 473–480.
Gipps, P. G. (1981). “A behavioral car-following model for computer simulation.” Transp. Res., Part B: Methodol., 15, 105–111.
Green, M. (2000). “’How long does it take to stop’ Methodological analysis of driver perception-brake times.” Transportation Human Factors, 2(3), 195–216.
Hammond, H. F. and Sorenson, L. J., and, eds. (1941). Traffic engineering handbook, H. F. Hammond and L. J. Sorenson, eds., Institute of Traffic Engineers and National Conservation Bureau, New York.
Harwood, D. W., May, A. D., Anderson, I. B., Leiman, L., and Archilla, A. R. (1999). “Capacity and quality of service of two-lane highways.” NCHRP Final Rep. No. 3-55(3), Midwest Research Institute.
Kim, J. (2006). “Estimation of capacity for two-lane two-way highways using simulation.” Ph.D. thesis, Pennsylvania State Univ., Pa.
Lan, C., and Menendez, M. (2003). “Truck speed profile models for critical length of grade.” J. Transp. Eng., 129(4), 408–419.
Leiman, L., Archilla, A. R., and May, A. D. (1998). “TWOPAS model improvements.” NCHRP Project Rep. No. 3-55(3), University of California, Berkeley, Calif.
Lerner, N., Llaneras, R., Smiley A., and Hanscom F. (2005). “Comprehensive human factors guidelines for road systems.” Task 8 Report, project final report. Westat, Rockville, Md.
Normann, O. K. (1942). “Results of highway capacity studies.” Public Roads, 23(4), 57–81.
Polus, A., Livneh, M., and Frischer, B. (2000). “Evaluation of the passing process on two-lane rural highways.” Transportation Research Record. 1701, Transportation Research Board, Washington, D.C., 53–60.
Rozic, P. (1992). “Capacity of two-lane, two-way rural highways: The new approach.” Transp. Res. Rec., 1365, 19–29.
Transportation Research Board. (2000). Highway capacity manual (HCM) 2000, National Research Council, Washington D.C.
Wardrop, J. G. (1952). “Some theoretical aspects of road traffic research.” Proc.- Inst. Civ. Eng., 1, 325–378.
Yagar, S. (1983). “Capacities for two-lane highways.” Aust. Road Res., 13(1), 28.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 136 • Issue 1 • January 2010
Pages: 61 - 66
Copyright
© 2010 ASCE.
History
Received: Nov 20, 2007
Accepted: May 12, 2009
Published online: Dec 15, 2009
Published in print: Jan 2010
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