Speed Factors on Two-Lane Rural Highways in Free-Flow Conditions
Abstract
The mean free-flow speed and its variability across drivers are considered important safety factors. Despite a large body of research on operating speeds, there is still much to learn about the factors of free-flow speeds, especially on tangent segments of two-lane rural highways. The roadway factors of speed dispersion across drivers are largely unknown. Also, the use of the entire free-flow speed distribution suggested by other authors has not yet been addressed. Consequently, the existing models are not aimed to evaluate the speed variability at a site. This paper presents free-flow speed models that identify factors of mean speed and speed dispersion on tangent segments and horizontal curves of two-lane rural highways. Ten highway variables, six of them functioning as both mean speed and speed dispersion factors, were identified as speed factors on tangent segments. Four highway and curve variables, two of them functioning as both mean speed and speed dispersion factors, were identified as speed factors on horizontal curves. The developed free-flow speed models have the same prediction capabilities as traditional ordinary-least-squares models developed for specific percentile speeds. The advantages of the developed models include predicting any user-specified percentile, involving more highway characteristics as speed factors than traditional regression models, and separating the impacts on mean speed from the impacts on speed dispersion.
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References
1. Tarris J. P., Poe C. M., Mason J. M. Jr., and Goulias K. G. Predicting Operating Speeds on Low-Speed Urban Streets: Regression and Panel Analysis Approaches. In Transportation Research Record 1523, TRB, National Research Council, Washington, D.C., 1996, pp. 46–54.
2. Fitzpatrick K., Carlson P., Brewer M. A., Wooldridge M. D., and Miaou S.-P. NCHRP Report 504: Design Speed, Operating Speed, and Posted Speed Practices. Transportation Research Board of the National Academies, Washington, D.C., 2003.
3. Garber N. J., and Gadiraju R. Factors Affecting Speed Variance and Its Influence on Accidents. In Transportation Research Record 1213, TRB, National Research Council, Washington, D.C., 1989, pp. 64–71.
4. Collins J., Fitzpatrick K., Bauer K. M., and Hardwood D. W. Speed Variability on Rural Two-Lane Highways. In Transportation Research Record: Journal of the Transportation Research Board, No. 1658, TRB, National Research Council, Washington, D.C., 1999, pp. 60–69.
5. Yagar S., and Van Aerde M. Geometric and Environmental Effects on Speeds of Two-Lane Highways. Transportation Research Part A: Policy and Practice, Vol. 17A, No. 4, 1983, pp. 315–325.
6. Yagar S. Predicting Speeds for Rural Two-Lane Highways. Transportation Research Part A: Policy and Practice, Vol. 18A, No. 1, 1984, pp. 61–70.
7. Polus A., Fitzpatrick K., and Fambro D. B. Predicting Operating Speeds on Tangent Sections of Two-Lane Rural Highways. In Transportation Research Record: Journal of the Transportation Research Board, No. 1737, TRB, National Research Council, Washington, D.C., 2000, pp. 50–57.
8. Islam N., and Seneviratne P. Evaluation of Design Consistency of Two-Lane Rural Highways. ITE Journal, Vol. 64, No. 2, 1994, pp. 28–31.
9. McFadden J., and Elefteriadou L. Evaluating Horizontal Alignment Design Consistency of Two-Lane Rural Highways: Development of New Procedure. In Transportation Research Record: Journal of the Transportation Research Board, No. 1737, TRB, National Research Council, Washington, D.C., 2000, pp. 9–17.
10. Fitzpatrick K., Elefteriadou L., Harwood D., Collins J., McFadden J., Anderson I., Krammes R., Irizarry N., Parma K., Bauer K., and Pas-setti K. Speed Prediction for Two-Lane Rural Highways. Report FHWA-RD-99–171. FHWA, U.S. Department of Transportation, 1999.
11. Bonneson J. A. Controls for Horizontal Curve Design. In Transportation Research Record: Journal of the Transportation Research Board, No. 1751, TRB, National Research Council, Washington, D.C., 2001, pp. 82–89.
12. Polus A., Poe C., and Mason J. Jr. Review of International Design Speed Practices in Roadway Geometric Design. Proc., International Symposium on Highway Geometric Design Practices, Boston, Mass., Chapter 5, 1995, pp. 1–8.
13. Morgenstern B., Mahoney D., and Warady B. Estimating Total Body Weight in Children on the Basis of Height and Weight: A Reevaluation of the Formulas of Mellits and Cheek. Journal of the American Society of Nephrology, Vol. 13, 2002, pp. 1884–1888.
14. Morrell C., Pearson J., Brant L., and Gordon-Salant S. Construction of Hearing Percentiles in Women with Non-Constant Variance from the Linear Mixed-Effects Model. Statistics in Medicine, Vol. 16, 1997, pp. 2475–2488.
15. Hsiao C. Analysis of Panel Data. Cambridge University Press New York, 1986.
16. Figueroa A., and Tarko A. Reconciling Speed Limits with Design Speeds. Report FHWA-IN-JTRP-2004–07. Joint Transportation Research Program, Purdue University, West Lafayette, Ind., 2004.
17. Poe C. M., and Mason J. M. Jr. Analyzing Influence of Geometric Design on Operating Speeds Along Low-Speed Urban Streets: Mixed-Model Approach. In Transportation Research Record: Journal of the Transportation Research Board, No. 1737, TRB, National Research Council, Washington, D.C., 2000, pp. 18–25.
18. A Policy on Geometric Design of Highways and Streets. AASHTO, Washington, D.C., 2001.
19. Washington S., Karlaftis M., and Mannering F. Statistical and Econometric Methods for Transportation Data Analysis. Chapman & Hall/CRC Press LLC, Boca Raton, Fla., 2003.
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Article first published: January 2005
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