Performance Assessment of the 2010 HCM and Its Calibrated Model in Estimation of Weaving and Non-Weaving Speed

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Transportation Engineering, Isfahan University of Technology, Isfahan, Iran

2 M.Sc. Grad., Transportation Research Institute, Isfahan University of Technology, Isfahan, Iran

Abstract

Calibration is a conventional method which is utilized to adapt traffic models based on local situations in order to achieve best results. One of the issues regarding the efficiency of this method is whether traffic models should be calibrated only in one or two major cities of a country or calibrated based upon a comprehensive selection of cities. Therefore, this study, which has used the actual speeds, attempts to evaluate the performance of the weaving model that was proposed in the fifth edition of Highway Capacity Manual (HCM 2010) and its calibrated model, which was calibrated in Tehran highways. In this regard, adequate field-data were collected on a ramp-weaving segment in Isfahan. The procedure was of 9 fifteen-minute time steps of recording at different hours of a working day. The analysis results indicated poor and app.ropriate performances by the HCM 2010 model in estimating speeds of non-weaving and weaving vehicles, respectively, for which the RMSE (Root Mean Square Error) values were obtained as 16.34 km/h and 2.11 km/h, respectively. Moreover, not only was the calibrated model unable to improve the performance of the original model, but also it affected the original model negatively and caused a larger difference in the model output compared to the actual values. Hence, calibrated models based on metropolises such as Tehran may not necessarily be app.lied to other cities and may lead to unrealistic results. This reflect the fact that traffic patterns in two cities of one country may be highly dissimilar.

Keywords


- AASHTO (American Association of State Highway and Transportation Officials) (2011) “A policy on geometric design of highways and streets”, 6th ed., Washington, DC., Chapter 2, pp. 60-70.
- AASHTO - American Association of State Highway and Transportation Officials (2010) “Highway safety manual”, 1st ed., Washington, DC., Part A, Chapter 2, pp. 12-15.
- Federal Highway Administration (2009) “Manual on uniform traffic control devices”, 2009 edition with revisions No. 1 and 2 incorporated, Dated May 2012, Washington, DC., Part 2, Chapter 2, pp. 27-110.
- Findley, D. J., Schroeder, B. J., Cunningham, C. M. and Brown, T. H. (2016) “Highway engineering planning, design, and operations”, USA: Elsevier, Part 5, pp. 293-357.
- Ghavidel Abraghan, R. and Afandizadeh Zargari, S. (2016) “Developing a model for estimating weaving and non-weaving speed within highways weaving segments (Tehran)”, International Journal of Transportation Engineering, Vol. 4, No. 2, pp. 75-86.
- Liu, X. C., Wang, Y., Schroeder, B. J. and Rouphail, N. M. (2012) “Quantifying cross- weave impact on capacity reduction for freeway facilities with managed lanes”, Transportation Research Record: Journal of the Transportation Research Board, Vol. 2278, No. 1, pp. 171-179.
- Moridpour, S., Sarvi, M. and Rose, G. (2010) “Lane changing models: a critical review”, Transportation Letters: The International Journal of Transportation Research, Vol. 2, No.3, pp.157-173.
- Pande, A. and Wolshon, B. (2016) “Traffic engineering handbook”, 7th ed., USA: John Wiley & Sons, Chapter 9, pp. 485-525.
- Roess, R. P. and Prassas, E. S. (2014) “The highway capacity manual: a conceptual and research history”, Vol.1, Switzerland: Springer International Publishing, Chapter 8, pp. 249-338.
- Roess, R. P., Prassas, E. S. and McShane, W. R. (2011) “Traffic engineering”, 4th ed., USA: Prentice Hall, Part 3, Chapter 15, pp. 316-360.
- Roess, R. P. and Ulerio, J. M. (2009) “Capacity of freeway weaving segments”, Transportation Research Record: Journal of the Transportation Research Board, Vol. 2130, No. 1, pp. 34-41.
- Skabardonis, A. and Kim, A. (2010) “Weaving analysis, evaluation and refinement”, California PATH Research Report, Institute of Transportation Studies, University of California, Berkeley, Report No: CA10-0982, Chapter 2, pp. 3-14.
- Skabardonis, A. and Mauch, M. (2015) “Evaluation of methodologies for analyzing freeway ramp weaving”, Transportation Research Record: Journal of the Transportation Research Board, Vol. 2483, No. 1, pp. 130-139.
- Sohrabi, S., Ovaici, K. and Ghanbarikarekani, M. (2016) “Estimating the capacity of the basic freeway section using headway method in developing countries (case study: Iran)”, International Journal of Transportation Engineering, Vol. 4, No. 2, pp. 127-136.
- Tavakoli Kashani, A., Sokouni Ravasani, M. and Ayazi, E. (2016) “Analysis of drivers' behavior using Manchester driver behavior questionnaire based on roadside interview in Iran”, International Journal of Transportation Engineering, Vol. 4, No. 1, pp. 61-74.
- TRB - Transportation Research Board  (2016) “Highway capacity manual, sixth edition: a guide for multimodal mobility analysis”, National Academy of Sciences, Washington, DC., Volume 2, Chapter 13, pp. 1-41.
- TRB - Transportation Research Board (2012) “NCHRP Report 600: human factors guidelines for road system”, 2nd. ed. National Academy of Sciences, Washington, DC., Part I, Chapter 1, pp. 1-2.
- TRB - Transportation Research Board (2010) “Highway capacity manual”, 5th ed., National Academy of Sciences, Washington, DC., Volume 2, Chapter 12, pp. 1-55.
- TRB -  Transportation Research Board (2000) “Highway capacity manual”, 4th ed., National Academy of Sciences, Washington, DC., Part III, Chapter 24, pp. 1-40.
- TRB - Transportation Research Board (1985) “Highway capacity manual”, 3rd ed., National Academy of Sciences, Washington, DC., Part II, Chapter 4, pp. 1-19.
- TRI - Transportation Research Institute and Kittelson (Kittelson & Associates) (2008) “Analysis of freeway weaving sections”, NCHRP Project 3-75 Final Report, Transportation Research Institute, Polytechnic University Brooklyn, N.Y., and Kittelson & Associates, Portland, Oregon, Chapter 1, pp. 1-23.
- Yi, L., Lu, J. and Ma, Y. (2011) “Analysis of freeway weaving section: a review and assessment of methods”, Paper presented at the 3rd International Conference on Transportation Engineering, Chengdu, July 23-25, pp. 2631-2636.
- Zhang, Y. (2005) “Capacity modeling of freeway weaving section”, PhD diss., Virginia Polytechnic Institute and State University, Chapter 2, pp. 5-25.