It is well known that road accidents tend to be more frequent in locations where a sudden change in road characteristics violates the driver's expectations. Most methods used to assess the design consistency are based on simplified speed profiles that give a coarse description of the vehicle dynamics along the road. This paper presents a new approach to quantify the road design consistency, based on continuous operating speed profiles. These profiles are based on the Gipps’ car-following equations, adapted to simulate the driver behaviour in the vicinity of horizontal curves under free-flow conditions. A methodology to calibrate and validate the Gipps’ behavioural parameters from field data is presented and applied to predict the speed profiles of three drivers for a set of rural road segments. The calibration is based on trajectory data collected with an instrumented vehicle and it follows an automated procedure that aims to minimize the differences between the predicted and observed speed profiles. The new consistency index is based on the deceleration distances and it allows to overcome some limitations of the existing methods.
Lobo A, Rodrigues C, Couto A. Free-Flow Speed Model Based on Portuguese Roadway Design Features for Two-Lane Highways. Transportation Research Record: Journal of the Transportation Research Board. 2013;2348: 12-8. doi:10.3141/2348-02
TRB. Modeling operating speed: synthesis report. Operational Effects of Geometrics Committee, 2011. Available from: http://onlinepubs.trb.org/onlinepubs/circulars/ec151.pdf
Gibreel GM, Easa SM, Hassan Y, El-Dimeery IA. State of the Art of Highway Geometric Design Consistency. Journal of Transportation Engineering. 1999;125(4): 305-13. doi:10.1061/(ASCE)0733-947X(1999)125:4(305)
AASHTO. A Policy on Geometric Design of Highways and Streets 2011. American Association of State Highway and Transportation Officials; 2011.
TRB. HCM 2010: Highway Capacity Manual. Washington, D.C.: Transportation Research Board – National Research Council; 2010.
Morrall J, Talarico R. Side friction demanded and margins of safety on horizontal curves. Transportation Research Record. 1994;1435: 145.
Passetti K, Fambro D. Operating Speeds on Curves With and Without Spiral Transitions. Transportation Research Record: Journal of the Transportation Research Board. 1999;1658: 9-16. doi:10.3141/1658-02
Fitzpatrick K, Elefteriadou L, Harwo od DW, Collins J, Mc-Fadden J, Anderson IB, et al. Speed prediction for twolane rural highways. US Department of Transportation; 2000. Available from: https://www.fhwa.dot.gov/publications/research/safety/ihsdm/99171/99171.pdf
Misaghi P, Hassan Y. Modeling Operating Speed and Speed Differential on Two-Lane Rural Roads. Journal of Transportation Engineering. 2005;131(6): 408-18. doi:10.1061/(ASCE)0733-947X(2005)131:6(408)
Ye Q, Tarko A, Sinha K. Model of Free-Flow Speed for Indiana Arterial Roads. Transportation Research Record: Journal of the Transportation Research Board. 2001;1776: 189-93. doi:10.3141/1776-24
Correia GHdA, Silva AB. Setting Speed Limits on Rural Two-Lane Highways by Modeling the Relationship between Expert Judgment and Measurable Roadside Characteristics. Journal of Transportation Engineering. 2011;137(3): 184-92. doi:10.1061/(ASCE)TE.1943-5436.0000210
Lamm R, Psarianos B, Mailaender T. Highway design and traffic safety engineering handbook; 1999.
Ng JCW, Sayed T. Effect of geometric design consistency on road safety. Canadian Journal of Civil Engineering. 2004;31(2): 218-27. doi:10.1139/l03-090
Cafiso S, Cava G, Montella A. Safety Index for Evaluation of Two-Lane Rural Highways. Transportation Research Record: Journal of the Transportation Research Board. 2007;2019: 136-45. doi:10.3141/2019-17
Hassan Y. Highway Design Consistency: Refining the State of Knowledge and Practice. Transportation Research Record: Journal of the Transportation Research Board. 2004;1881: 63-71. doi:10.3141/1881-08
Krammes RA, Brackett R, Shafer M, Ottesen J, Anderson I, Fink K, et al. Horizontal alignment design consistency for rural two-lane highways; 1995.
Wang Y, Xu G, Bai H. Operating speed based alignment consistency evaluation using driving simulator: case studies from Taigan freeway in Jiangxi, China. Promet – Traffic & Transportation. 2013;25(1): 23-31. doi:10.7307/ptt.v25i1.1244
Camacho-Torregrosa FJ, Pérez-Zuriaga AM, Campoy-Ungría JM, García-García A. New geometric design consistency model based on operating speed profiles for road safety evaluation. Accident Analysis & Prevention. 2013;61: 33-42. doi:10.1016/j.aap.2012.10.001
Polus A, Mattar-Habib C. New Consistency Model for Rural Highways and Its Relationship to Safety. Journal of Transportation Engineering. 2004;130(3): 286-93. doi:10.1061/(ASCE)0733-947X(2004)130:3(286)
Pérez-Zuriaga AM, Camacho-Torregrosa FJ, García A. Tangent-to-Curve Transition on Two-Lane Rural Roads Based on Continuous Speed Profiles. Journal of Transportation Engineering. 2013;139(11): 1048-57. doi:10.1061/(ASCE)TE.1943-5436.0000583
Gipps PG. A behavioural car-following model for computer simulation. Transportation Research Part B: Methodological. 1981;15(2): 105-11.
Sivanandam SN, Deepa SN. Introduction to Genetic Algorithms. Springer, Berlin, Germany; 2007.
Sivanandam SN, Deepa SN. Introduction to Genetic Algorithms. Springer, Berlin, Germany; 2007. MathWorks I. Genetic Algorithm and Direct Search Toolbox for Use with MATLAB®: User's Guide: Math-Works; 2005.
Vasconcelos L, Seco Á, Silva AB. Hybrid Calibration of Microscopic Simulation Models. In: Sousa JF, Rossi R, editors. Computer-based Modelling and Optimization in Transportation. Advances in Intelligent Systems and Computing. 262: Springer International Publishing; 2014. p. 307-20. doi:10.1007/978-3-319-04630-3_23
Guest Editor: Eleonora Papadimitriou, PhD
Editors: Dario Babić, PhD; Marko Matulin, PhD; Marko Ševrović, PhD.
The mission of our journal is to provide high quality communication of research results, which is crucial for the effectiveness of scientific research, the promotion of scientific information, new ideas, and original research in the field of traffic and transportation engineering.
1848-4069
0353-5320
Proud publisher
Accelerating Discoveries in Traffic Science |
2024 © Promet - Traffic&Transportation journal
