Studying the effect of spiral curves and intersection angle, on the accident ratios in two-lane rural highways in Iran
Abstract
Safety in highways is one of the most important subjects in Transportation Engineering. Increasing rate of vehicles and the needs to design or geometrically modifying the highways, emphasized on the safe-designing of the roadways more than before. Between the constructive components of the highway, horizontal curves due to the more occurrences of accidents are of great importance. The American ministry of highway and transportation introduced the software IHSDM, with variant capabilities, to predict accidents. In this research, five types of curves (simple circle curve and clothoid-circle-clothoid) at different intersection angles were designed, and accident rates based on the standard specifications on each curve was predicted by using the IHSDM, and the results are compared with each other. Finally, by processing the curves of accident rates versus the curves types and intersection angle, and comparing them with each other, the necessity of using spiral curves in the highway design is emphasized.
References
- Iran’s Management and Planning Organization (1992). “Highways Geometrical Design Standard “, 161 issue, publication of Iran’s Management and Planning Organization.
- A Policy on Geometric Design of Highways and Streets (2004) ,AASHTO ,Washington D.C.
- Bitzl .(1964) 'The safety level of roads', Research road construction and road traffic technique' Ministry of transportation, vol.28
- Feuchtinger, M.E., Christoffers, C. (1953) 'Driving Dynamic Investigation as Measure of Road-Traffic-Safety' , Journal for traffic safety, vol.1
- Kerbs, H.G., 'Kloechner, J. H. (1977) 'Investigation of the Effect of Highway and traffic conditions outside build-up areas on accident rates', research road construction and road traffic technique, ministry of transportation
- Lamm, R.,Mailaender, T. and Psarianos B. (1999) 'Highway design and traffic safety engineering handbook'
- Zegeer, C.V. , Twomey, J.M.Heckman, M.L. and Hayward, J.C.(1992) ' Safety effectiveness of highway design features'
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
