Highlights Safety indicators for streets and intersections of a network are developed. The indicators are validated with existing and past safety researches. Safety indicators are proxy for potential risk of collisions with other vehicles. Application example on a real-world street network is shown. Non-inferior safety-based path is found for older drivers and bicyclists.
Abstract This paper presents a safety-based path finding methodology for older drivers and bicyclists in an urban area. The paths are estimated based on costs consisting of both safety and travel time. Safety is evaluated against potential risk of a crash involving an older driver (or a bicyclist) with other vehicles present on the road. To accomplish this, simple formulations are developed for safety indicators of streets and intersections, which are actually generic irrespective of the type of road user. Traffic attributes such as speed and density, driver attributes such as perception-reaction time and street attributes of length and tire-to-road friction coefficient are taken into account in building the safety indicators. Thus, the safety indicators do not necessarily require historical crash data which may or may not be available during path finding. Subsequently, a multi-objective shortest path algorithm is presented that identifies the best path (the non-inferior path) from amongst a set of selected safest paths with due considerations to travel time incurred on each. A simple application example of the proposed methodology is demonstrated on an existing street network system from the City of College Station, Texas. The contributions of this research are twofold – first, the safety indicators can be used by planners in determining high crash potential sites – streets and/or intersections – and second, the safety-based path finding methodology developed in this paper can be integrated with modern day route planning devices and tools in guiding older drivers and bicyclists within an Intelligent Transportation Systems framework.
Safety-based path finding in urban areas for older drivers and bicyclists
Tramsportation Research, Part C: Emerging Technologies ; 48 ; 143-157
2014-08-24
15 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Safety-based path finding in urban areas for older drivers and bicyclists
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