We present the ROCA (ROad Curvature Analyst) software, in the form of an ESRI ArcGIS Toolbox, intended for vector line data processing. The software segments road network data into tangents and horizontal curves. Horizontal curve radii and azimuth of tangents are then automatically computed. Simultaneously, additional frequently used road section characteristics are calculated, such as the sinuosity of a road section (detour ratio), the number of turns along an individual road section and the average cumulative angle for a road section. The identification of curves is based on the naïve Bayes classifier and users are allowed to prepare their own training data files. We applied ROCA software to secondary roads within the Czech road network (9,980 km). The data processing took less than ten minutes. Approximately 43% of the road network in question consists of 42,752 horizontal curves. The ROCA software outperforms other existing automatic methods by 26% with respect to the percentage of correctly identified curves. The segmented secondary roads within the Czech road network can be viewed on the roca.cdvgis.cz/czechia web-map application. We combined data on road geometry with road crashes database to develop the crash modification factors for horizontal curves with various radii. We determined that horizontal curves with radii of 50 m are approximately 3.7 times more hazardous than horizontal curves with radii accounting for 1000 m. ROCA software can be freely downloaded for noncommercial use from https://roca.cdvinfo.cz/ website.

CDV Transport Research Centre Brno Czech Republic

Zobrazit více v PubMed

Li Z, Chitturi MV, Bill AR, Zheng D, Noyce DA. Automated Extraction of Horizontal Curve Information for Low-Volume Roads. Transportation Research Record. 2015;2472: 172–184.

Andrášik R, Bíl M. Efficient Road Geometry Identification from Digital Vector Data. Journal of Geographical Systems. 2016;18(3): 249–264.

Xu H, Wei D. Improved Identification and Calculation of Horizontal Curves with Geographic Information System Road Layers. Transportation Research Record. 2016;2595: 50–58.

McBean PA. The influence of road geometry at a sample of accident sites TRRL Laboratory Report 1053. Transport and Road Research Laboratory, Crowthorne: 1982.

Othman S, Thomson R, Lannér G. Using Naturalistic Field Operational Test Data to Identify Horizontal Curves. J. Transp. Eng. 2012;138(9): 1151–1160.

Fitzpatrick KPE, Lord D, Park BJ. Horizontal Curve Accident Modification Factor with Consideration of Driveway Density on Rural Four-Lane Highways in Texas. Journal of Transportation Engineering. 2010;136(9): 827–835.

Fink KL, Krammes RA. Tangent Length and Sight Distance Effects on Accident Rates at Horizontal Curves on Rural Two-Lane Roads. Transportation Research Record. 1995;1500: 162–167.

Persaud B, Retting R, Lyon C. Guidelines for identification of hazardous highway curves. Transportation Research Record. 2000;1717: 14–18.

Zegeer CV, Stewart RJ, Council FM, Reinfurt DW, Hamilton E. Safety Effects of Geometric Improvements on Horizontal Curves. Transportation Research Record. 1992;1356: 11–19.

Sakshaug K. Effekt av overhøyde i kurver: Beskrivelse av datamaterialet. Notat av 2.11.1998. SINTEF, Bygg og miljøteknikk, Trondheim.

Khan G, Bill A, Chitturi M, Noyce DA. Safety Evaluation of Horizontal Curves on Rural Undivided Roads. Transportation Research Record. 2014;2386: 147–157.

Bogenreif C, Souleyrette RR, Hans Z. Identifying and Measuring Horizontal Curves and Related Effects on Highway Safety. Journal of Transportation Safety & Security. 2012;4(3): 179–192.

Findley D, Hummer JE, Rasdorf W, Zegeer CV, Fowler TJ. Modeling the impact of spatial relationships on horizontal curve safety. Accident Analysis and Prevention. 2012;45: 296–304. 10.1016/j.aap.2011.07.018 PubMed DOI

ESRI. ArcGIS Desktop: Release 10.2 Redlands. Environmental Systems Research Institute, CA. 2013.

Jurewicz C, Pyta V. Effect of clear zone widths on run-off-road crash outcomes. In: Proceedings of Australasian Road Safety Research, Policing and Education Conference, 31 August-3 September 2010, Canberra, Australia.

Elvik R. International transferability of accident modification functions for horizontal curves. Accident Analysis and Prevention. 2013;59: 487–496. 10.1016/j.aap.2013.07.010 PubMed DOI

Hauer E. Safety and the choice of degree of curve. Transportation Research Record. 1999;1665: 22–27.

Findley DJ, Zegeer CV, Sundstrom CA, Hummer JE, Rasdorf W, Fowler TJ. Finding and measuring horizontal curves in a large highway network: a GIS approach. Public Works Manag Policy. 2012;17(2): 189–211.

Johnston IR. Modifying driver behaviour on rural road curves: A review of recent research. In Proc. 11th Australian Road Research Board (ARRB) Conf., ARRB Group Limited. 1982;11: 115–124.

Cardoso JL. Safety assessment for design and redesign of horizontal curves. In: Paper Presented at 3rd International Symposium on Highway Geometric Design, June 29-July 1, 2005, Chicago.

Tan PN, Steinbach M, Kumar V. Introduction to data mining Addison-Wesley, USA: 2005.

James G, Witten D, Hastie T, Tibshirani R. An Introduction to Statistical Learning. Springer, New York; 2015.

Dougherty G. Pattern recognition and Classification: An Introduction. Springer, New York: 2013.

Friedman N. On Bias, Variance, 0/1 –Loss, and the Curse-of-Dimensionality. DataMining and Knowledge Discovery. 1997;1: 55–77.

Forman G, Cohen I. Learning from Little: Comparison of Classifiers Given Little Training. In: Boulicaut J. F., Esposito F., Giannotti F., Pedreschi D. (eds) Knowledge Discovery in Databases: PKDD 2004. Lecture Notes in Computer Science. 2004;3202.

Domingos P, Pazzani M. On the Optimality of the Simple Bayesian Classifier under Zero-One Loss, Machine Learning. 1997;29: 103–130.

John G, Langley P. Estimating continuous distributions in Bayesian classifiers. Proceedings of the Eleventh Conference on Uncertainty in Artificial Intelligence. Montreal, Canada: Morgan Kaufmann. 1995: 338–345.

Imran M, Hassan Y, Patterson D. GPS–GIS-based procedure for tracking vehicle path on horizontal alignments. Comput Aided Civil Infrastruct Eng. 2006; 21: 383–394.

Rasdorf W, Findley DJ, Zegeer CV, Sundstrom CA, Hummer JE. Evaluation of GIS applications for horizontal curve data collection. Journal of Computing in Civil Engineering. 2012;26(2): 191–203.

Alian S, Baker RGV, Wood S. Rural casualty crashes on the Kings Highway: A new approach for road safety studies. Accident Analysis and Prevention. 2016;95: 8–19. 10.1016/j.aap.2016.06.005 PubMed DOI

Wang C, Quddus M, Ison S. The effects of area-wide road speed and curvature on traffic casualties in England. Journal of Transport Geography. 2009;17: 385–395.

Haynes R, Lake IR, Kingham S, Sabel CE, Pearce J, Barnett R. The influence of road curvature on fatal crashes in New Zealand. Accident Analysis and Prevention. 2008;40: 843–850. 10.1016/j.aap.2007.09.013 PubMed DOI