Improved speed-estimation techniques for planning applications were developed and tested. Comparisons with field data and simulation results indicate that the recommended techniques provide better accuracy and consistency with the procedures contained in the 1994 update of the Highway Capacity Manual. These speed-estimation techniques will improve the accuracy of long-range transportation planning models for predicting travel time, delay, and air-pollutant emissions.
Get full access to this article
View all access options for this article.
References
1.
Special Report 209: Highway Capacity Manual. TRB, National Research Council, Washington, D.C., 1994.
2.
DowlingR., et al. NCHRP Report 387: Planning Techniques to Estimate Speeds and Service Volumes. TRB, National Research Council, Washington, D.C., 1997.
3.
BranstonD.Link Capacity Functions: A Review. Transportation Research, Vol. 10, 1976, pp. 223–236.
4.
Traffic Assignment Manual. U.S. Department of Commerce, Bureau of Public Roads, June1964.
5.
DowlingR., and SkabardonisA.. Improving the Average Travel Speeds Estimated by Planning Models. In Transportation Research Record 1360, TRB, National Research Council, Washington D.C., 1993.
6.
SinghR.Beyond the BPR Curve: Updating Speed-Flow and Speed-Capacity Relationships in Traffic Assignment. Presented at 5th Conference on Transportation Planning Methods Applications, Seattle, Wash., April1995.
7.
DavidsonK. B. A Flow-Travel Time Relationship for Use in Transportation Planning. Proc., 3rd ARRB Conference, Vol. 3, No. 1, 1966.
8.
BoyceD. E., et al. The Effect of Equilibrium Trip Assignment of Different Link Congestion Functions. Transportation Research, Vol. 15A, No. 3, 1981, pp. 223–232.
9.
AkcelikR.Travel Time Functions for Transport Planning Purposes: Davidson’s Function, Its Time Dependent Form and an Alternative Travel Time Function. Australian Road Research, Vol. 21, No. 3, Sept.1991.
10.
Van AerdeM. ASingle Regime Speed-Flow-Density Relationship for Freeways and Arterials. Presented at the 74th Annual Meeting, TRB, National Research Council, Washington, D.C., 1995.
11.
LiemanL., and MayA. D.. An Integrated System of Freeway Corridor Simulation Models. In Transportation Research Record 1320, TRB, National Research Council, Washington, D.C., 1991.
12.
SkabardonisA., et al. The I-880 Field Experiment: Database Development and Incident Delay Estimation Procedures. In Transportation Research Record 1554, TRB, National Research Council, Washington, D.C., 1996.
13.
WallaceC. E., et al. TRANSYT-7F User’s Manual. McTrans Center, Dec.1991.
