A reliability-based dynamic re-routing algorithm for in-vehicle navigation

This paper presents a new algorithm for a car navigation system, whose purpose is to offer a reliable re-route to the driver in case he/she deviates from the route he/she has been following, or if a traffic incident is reported en route. A reliable route is defined as one that has a low probability of being congested. The new method makes use of the A* route finding algorithm and introduces a link penalizing procedure to avoid unreliable (i.e. potentially congested) and incident-affected links in order to re-route the driver from his/her current position to his/her destination, while constraints are imposed on the route output by the algorithm so as to ensure driver acceptability. The new algorithm, called RDIN-R, is first described and then tested through a simulation experiment on the road network of Munich, Germany.