This paper deals with safety at horizontal curves on two-lane roads outside urban areas and the way the road design standards of different European countries account for this safety aspect. After a review of some research results, the main aspects of curve geometry and the curve's place in the horizontal alignment are analyzed. The main conclusions are that the traditional design speed approach is insufficient and that formal complementary rules in road design standards, especially to improve compatibility between successive elements of the alignment, must be introduced. If such complementary rules already exist in some national standards, they are neither frequent nor homogeneous throughout the different countries, and it seems that they are not based on sufficiently developed knowledge.
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References
1.
AGR, European Agreement on Main International Traffic Arteries.Economic Commission for Europe, United Nations, Genève, 1975, amendment 1988.
2.
O'CinnéideD., McAuliffeN., and O'DwyerD.Comparison of Road Design Standards and Operational Regulations in EC and EFTA Countries. Report for the Commission of the European Communities. University College of Cork, Ireland, 1993.
3.
RuytersH.Established International Road Design Standards. In Safety Effects of Road Design Standards. First Interim Report. Stichting Wetenschappelijk Onderzoek Verkeersveiligheid, Leidschendam, Netherlands, 1993.
4.
Programmes Intégrés de Sécurité Routière.Organization for Economic Cooperation and Development, Paris, 1984.
5.
KrebsH. G., and KlöcknerJ. H. Untersuchungen über Unfallraten in Abhängigkeit von Strassen- und Verkehrsbedingungen ausserhalb geschlossener Ortschaften. Forschung Strassenbau und Strassen-verkehrstechnik, Vol. 223, 1977, pp. 1–63.
6.
ShrewsburyJ. S., and SumnerS. L.Effects on Safety of Marginal Design Elements.Proc., 8th PTRC Summer Annual Meeting.PTRC Education and Research Services, London, 1980.
7.
MatthewsL. R., and BarnesJ. W.Relation between Road Environment and Curve Accidents.Proc., 19th Conference of the Australian Road Research Board.ARRB, Vermont South, 1988, pp. 105–120.
8.
ZegeerC.V., StewartJ. R., CouncilF. M., ReinfurtD. W., and HamiltonE.Safety Effects of Geometric Improvements on Horizontal Curves. In Transportation Research Record 1356, TRB, National Research Council, Washington, D.C., 1992, pp. 11–19.
9.
Research on Road Traffic.Road Research Laboratory, Her Majesty's Stationery Office, London, 1965.
10.
KosasihD., RobinsonR., and SnellJ., 1987. A Review of Some Recent Geometric Road Standards and Their Application to Developing Countries. TRRL Research Report 114. Transport and Road Research Laboratory, Crowthorne, Berkshire, England, 1987.
11.
BaldwinD. M.The Relation of Highway Design to Traffic Accident Experience. Presented at AASHO convention group meetings, 1946, pp. 103–109.
12.
RenaultJ., DeussC., ChambonA., and GallenC.Statistique Appliquée, Etude des Accidents en Virage sur Route Nationale. Ecole Nationale de la Statistique et de l'Administration Economique, Service d'Etudes Techniques des Routes et Autoroutes, Bagneux, France, 1993.
13.
TrappK. H.Analyse und Beseitigung von Unfallstellen in ausserörtlichen Strassennetz. Proc., International Conference Roads and Traffic 2000, Vol. 4/2, Road and Transportation Research Association, Cologne, Germany, 1988, pp. 165–169.
14.
YerpezJ., and FerrandezF.Caractéristiques Routières et Sécurité. Synthèse INRETS 2. Institut National de Recherche sur les Transports et leur Sécurité, Arcueil, France, 1986.
15.
VirsuV.Underestimation of Curvature and Task Dependence in Visual Perception of Form. Perception and Psychophysics, Vol. 9, 1971, pp. 339–342.
16.
ShinarD., McDowellE. D., and RockwellT. H.Improving Driver Performance on Curves in Rural Highways Through Perceptual Changes. Report EES 428. Ohio State University, Engineering Experiment Station, 1974.
17.
FildesB. N., and TriggsT. J.The Effect of Changes in Curve Geometry in Magnitude Estimates of Road-like Perspective Curvature. Perception and Psychophysics, Vol. 37, No. 3, 1985, pp. 218–224.
18.
StewartD., and ChudworthC. J.A Remedy for Accidents at Bends. Traffic Engineering and Control, Vol. 31, No. 2, 1990, pp. 88–93.
19.
RiemersmaJ. B. J.The Effect of Transition Curves and Superelevation on the Perception of Road-curve Characteristics. Report IZF 1989 C-18. Institute for Perception, Soesterberg, Netherlands, 1989.
20.
DroulezJ.Etude des Indices Sensoriels Utilisés dans l'Estimation de la Courbure d'un Virage, Rapport Intermédiaire.Laboratoire de Physiologie Neurosensorielle, Paris, 1986.
21.
DroulezJ.Analyse des Indices Sensoriels Impliqués dans la Perception de la Courbure des Virages, Rapport Final.Laboratoire de Physiologie Neurosensorielle, Paris, 1988.
22.
NeumanT. R.Discriminant Analysis as a Tool for Investigating Highway Safety Relationships. ITE Journal, Vol. 54, No. 10, 1984, pp. 16–22.
23.
FaureB., VerhéeF., and LucasJ.Techniques Nouvelles de Couches de Roulement. Les Enrobés Drainants. Bulletin des Laboratoires des Ponts et Chaussées 172, Laboratoire Central des Ponts et Chaussées, Paris, 1991, pp. 47–61.
24.
SiquotC., BrenacT., AubinH., and DecammeC.La Sécurité des Routes Secondaires.Service d'Etudes Techniques des Routes et Autoroutes, Bagneux, France, 1987.
25.
BrenacT.Speed, Safety and Highway Design. Recherche Transports Sécurité, English Issue 5, Institut National de Recherche sur les Transports et leur Sécurité, Arcueil, France, 1990, pp. 69–74.
26.
LeishJ. E., and LeishJ. P.New Concepts in Design-Speed Application. In Transportation Research Record 631, TRB, National Research Council, Washington, D.C., 1977, pp. 5–14.
27.
LammR., and ChoueiriE. M.Recommendations for Evaluating Horizontal Design Consistency Based on Investigation in the State of New York. In Transportation Research Record 1122, TRB, National Research Council, Washington, D.C., 1987, pp. 68–78.
28.
KrammesR., and GlascockS. W.Geometric Inconsistencies and Accident Experience on Two-Lane Rural Highways. In Transportation Research Record 1356, TRB, National Research Council, Washington, D.C., 1992, pp. 1–10.
29.
Departmental Standard TD 9/93, Highway Link Design.Department of Transport (U.K.), London, 1993.
30.
Departmental Advice Note TA 43/84, Highway Link Design.Department of Transport (U.K.), London, 1984.
31.
Road and Pathtypes, Catalogue of Types for New Roads and Paths in Rural Areas. Road Directorate, Technical Committee on Road Standards, Denmark, 1981.
32.
Richtlinien für die Anlage von Strassen (RAS-L1), Teil Linienführung, Abschnitt 1: Elemente der Linienführung.Forschungsgesellschaft für Strassen- und Verkehrswesen, Cologne, Germany, 1984.
33.
Aménagement des Routes Principales (ARP). Direction des Routes, Service d'Etudes Techniques des Routes et Autoroutes, Bagneux, France, 1994.
34.
GambardJ. M., and LouahG.Vitesses Pratiquées et Géométrie de la Route.Service d'Etudes Techniques des Routes et Autoroutes, Bagneux, France, 1986.
35.
RAL-L1 Kommentar. Kommentar zu den Richtlinien für die Anlagen von Landstrassen, Teil Linienführung, Abschnitt Elemente der Linienführung, Ausgabe 1973.Forschungsgesellschaft für das Strassenwesen, (Cologne, Germany), 1979.
36.
Richtlinien voor het Ontwerpen van Niet-Autosnelwegen (RONA), Hoofdstuk IV, Alignement.DVK, Rijkswaterstaat, Rotterdam, Netherlands, 1989.
37.
German Contribution to the Question IV, Interurban Roads and Motorways. Proc., 18th Road World Congress, Permanent International Association of Road Congresses, Paris, 1987.
