Operating Speed Based Alignment Consistency Evaluation Using Driving Simulator: Case Studies from Taigan Freeway in Jiangxi, China

  • Yonggang Wang
  • Guomiao Xu
  • Han Bai
Keywords: safety performance, geometric design consistency, driving simulator, operating speed, alignment element


Geometric design consistency refers to the conformance of a proposed or existing freeway’s geometry with the driver’s expectancy. Considerable efforts have been undertaken to develop potential quantitative consistency measures and models to estimate them. However, little work has been focused on the facts of freeways in China, especially in mountainous areas. The primary objective of this study is to examine and quantify the design consistency of a freeway, using an interactive driving simulator, so as to identify any inconsistency on the roadway geometry and improve its overall safety performance. More specifically, the techniques to evaluate the consistency of a geometric design depend on three criteria: design consistency, operating speed consistency, and consistency in driving dynamics, as well as three levels of consistency: good, acceptable and poor. In the case of Taigan Freeway, a part of G45 Daguang Freeway in Jiangxi, China, a 21km long segment has been divided into 38 sections including 22 curves and 16 tangents, and transferred into the graphics models in the simulator system. There were 42 drivers required to take part in the simulation experiment and the speed, location of vehicle, and other real time data were recorded as well. The findings have shown that these proposed measures and standards can identify a geometric inconsistency more effectively when there is a large rate of change in the alignment elements for a successive roadway segment.


Gibreel, G.M., Easa, S.M., Hassan, Y., et al.: “State of the Art of Highway Geometric Design Consistency”, Journal of Transportation Engineering, Vol. 125, No. 4, pp. 305–313, 1999

Castro, M., Sanchez, J.F., Sanchez, J.A., et al.: “Operating Speed and Speed Differential for Highway Design Consistency”, Journal of Transportation Engineering, Vol. 137, No. 11, pp. 837–840, 2011

Ng, J.C.W., Sayed, T.: “Effect of Geometric Design Consistency on Road Safety”, Canadian Journal of Civil Engineering, Vol. 31, No. 2, pp. 218–227, 2004

Lord, D., Bonneson, J.A.: “Role and Application of Accident Modification Factors within Highway Design Process”, Transportation Research Record, No. 1961, pp. 65–73, 2006

Himes, S., Donnell, E. T., Porter, R.J.: “New Insights on Evaluations of Design Consistency for Two-lane Highways”, Transportation Research Record, No. 2262, pp. 31–41, 2011

Hassan, Y., Sayed, T., Tabernero, V.: “Establishing Practical Approach for Design Consistency Evaluation”, Journal of Transportation Engineering, Vol. 127, No. 4, 2001, pp. 295–302

Messer, C.J.: “Methodology for Evaluating Geometric Design Consistency”, Transportation Research Record, No. 757, pp. 7–14, 1980

Cafiso, S., La Cava, G.: “Driving Performance, Alignment consistency, and Road Safety”, Transportation Research Record, No. 2102, pp. 1–8, 2009

Lamm, R., Choueiri, E.M., Hayward, J.C., et al.: “Possible Design Procedure to Promote Design Consistency in Highway Geometric Design on Two-Lane Rural Roads”, Transportation Research Record, No. 1195, pp. 111–122, 1988

D’Andrea, A., Pellegrino, O.: “Application of Fuzzy Techniques for Determining the Operating Speed Based on Road Geometry”, Promet Traffic & Transportation, Vol. 24, No. 3, pp. 203–214, 2012

Donnell, E.T., Gross, F., Stodart, B., et al.: “Appraisal of the Interactive Highway Safety Design Model’s Crash Prediction and Design Consistency Modules: Case Studies from Pennsylvania”, Journal of Transportation Engineering, Vol. 135, No. 2, pp. 62–73, 2009

Pellegrino, O.: “Prediction of Driver’s Workload by Means of Fuzzy Techniques”, The Baltic Journal of Road and Bridge Engineering, Vol. 7, No. 2, pp. 120–128, 2012

Galante, F., Mauriello, F., Montella, A., et al.: “Traffic Calming along Rural Highways Crossing Small Urban Communities: Driving Simulator Experiment”, Accident Analysis and Prevention, Vol. 42, No. 6, pp. 1585–1594, 2010

Van Der Horst, A.R.A., Hogema, J.H.: “Driving Simulator Research on Safe Highway Design and Operation”, Transportation Research Record, No. 2248, pp. 87–95, 2011

Cho, S.L., Yi, K.C., Lee, J.H., et al.: “Manoeuvring Speed of a 66 Autonomous Vehicle Using a Database Obtained from Multi-body Dynamic Simulation”, Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, Vol. 223, No. 8, pp. 979–985, 2009

Kattan, L., Tay, R., Acharjee, S.: “Managing Speed at School and Playground Zones”, Accident Analysis and Prevention, Vol. 43, No. 5, pp. 1887–1891, 2011

Banihashemi, M., Dimaiuta, M., Wang, H.: “Operating Speed Model for Low-speed Rural Two-Lane Highways: Design Consistency Module for Interactive Highway Safety Design Model”, Transportation Research Record, No. 2223, pp. 63–71, 2011

Lamm, R., Psarianos, B., Soilemezoglou, G., et al.: “Driving Dynamic Aspects and Related Safety Issues for Modern Geometric Design of Non-built-up Roads”,Transportation Research Record, No. 1523, pp. 34–45, 1996

Zuriaga, A.M.P., Garcia, A.G., Torregrosa, F.J.C., et al. “Modeling Operating Speed and Deceleration on Two-lane Rural Roads with Global Positioning System Data”, Transportation Research Record, No. 2171, pp. 11–20, 2010

Cafiso, S., La Cava, G.: “Driving Performance, Alignment Consistency, and Road Safety”, Transportation Research Record, No. 2102, pp. 1–8, 2009

Ismail, K., Sayed, T.: “Risk-optimal Highway Design: Methodology and Case Studies”, Safety Science, Vol. 50, No. 7, pp. 1513–1521, 2012

How to Cite
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. 1;25(1):23-1. DOI: 10.7307/ptt.v25i1.1244