The relationship between design speeds and operating speeds on twolane rural highway alignments is evaluated. The current policy on design speed and its origins is described, and empirical evidence of disparities between design speeds and operating speeds are presented. U.S. policy on selecting and applying design speeds is critiqued, modifications to the design-speed concept in Australia and Europe are discussed, and possible revisions to U.S. policy on design speed are identified.
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References
1.
A Policy on Geometric Design of Highways and Streets. AASHTO, Washington, D.C., 1990 [addendum on Interim Selected Metric Values for Geometric Design, 1993].
2.
CronF. W.Highway Design for Motor Vehicles—A Historical Review. Part 5: The Dynamics of Highway Curvature. Public Roads, Vol. 39, No. 4, March1976, pp. 163–171.
3.
CronF. W.Highway Design for Motor Vehicles—A Historical Review. Part 6: Development of a Rational System of Geometric Design. Public Roads, Vol. 40, No. 1, June1976, pp. 9–18.
4.
GoodM. C.Road Curve Geometry and Driver Behaviour. ARRB Special Report No. 15, Australian Road Research Board, Victoria, Australia, 1978.
5.
McLeanJ.An Alternative to the Design Speed Concept for Low Speed Alignment Design. In Transportation Research Record 702, TRB, National Research Council, Washington, D.C., 1979, pp. 55–63.
6.
FitzpatrickK., and KahlK.. A Historical and Literature Review of Horizontal Curve Design. Report No. TX-92/1949-1. Texas Department of Transportation, Austin, Tex., 1992.
7.
MerrittD. R.Safe Speeds on Curves: A Historical Perspective of the Ball Bank Indicator. ITE Journal, Vol. 58, No. 9, Sept.1988, pp. 15–19.
8.
YoungW. R.Road Design for Uniform Speed. Engineering News Record, Vol. 105, 1930, p. 539.
9.
BarnettJ.Safe Side Friction Factors and Superelevation Design. HRB Proc., Vol. 16, 1936, pp. 69–80.
10.
MesserC. J., MounceJ. M., and BrackettR. Q.. Highway Geometric Design Consistency Related to Driver Expectancy. Vol. III, Methodology for Evaluating Geometric Design Consistency. Report No. FHWA/RD-81/037. FHWA, Washington, D.C., 1981.
11.
ChowdhuryM. A., WarrenD. L., and BissellH.. Analysis of Advisory Speed Setting Criteria. Public Roads, Vol. 55, No. 3, Dec.1991, pp. 65–71.
12.
Designing Safer Roads: Practices for Resurfacing, Restoration, and Rehabilitation. Special Report 214. TRB, National Research Council, Washington, D.C., 1987.
13.
McLeanJ. R.Speeds, Friction Factors, and Alignment Design Standards. Research Report ARR 154. Australian Road Research Board, Victoria, Australia, 1988.
14.
HaywardJ. C.Highway Alignment and Superelevation: Some Design-Speed Misconceptions. In Transportation Research Record 757, TRB, National Research Council, Washington, D.C., 1980, pp. 22–25.
15.
KanellaidisG.Aspects of Highway Superelevation Design. Journal of Transportation Engineering, Vol. 117, No. 6, Nov./Dec.1991, pp. 624–632.
16.
PietruchaM. T., OpielaK. S., KnoblauchR. L., and CriglerK. L.. Motorist Compliance with Standard Traffic Control Devices. Report No. FHWA-RD-89-103. FHWA, U.S. Department of Transportation, 1989.
17.
GlennonJ. C., NeumanT. R., and LeischJ. E.. Safety and Operational Considerations for Design of Rural Highway Curves. Report No. FHWA/RD-86/035. FHWA, U.S. Department of Transportation, 1985.
18.
LeeC. H.A Study into Driver-Speed Behaviour on a Curve by Using Continuous Speed Measurement Method. Proceedings of the Australian Road Research Board, Vol. 14, Pt. 4, Sept.1988, pp. 37–46.
19.
CollinsK. M., and KrammesR. A.. Preliminary Validation of a Speed-Profile Model for Design Consistency Evaluation. In Transportation Research Record 1523, TRB, National Research Council, Washington, D.C., 1996, pp. 11–21.
20.
KrammesR. A., BrackettR. Q., ShaferM. A., OttesenJ. L., AndersonI. B., FinkK. L., CollinsK. M., PendletonO. J., and MesserC. J.. Horizontal Alignment Design Consistency for Rural Two-Lane Highways. Report FHWA-RD-94-034. FHWA, U.S. Department of Transportation, 1995.
