An Alternative Approach to Alternative Routes: HiDAR

Alternatives to a shortest path are a common feature for modern navigation providers. In contrast to modern speed-up techniques, which are based on the unique distance between two locations within the map, computing alternative routes that might include slightly suboptimal routes seems a way more difficult problem. Especially testing a possible alternative route for its quality can so far only be done utilizing considerable computational overhead. This forces current solutions to settle for any viable alternative instead of finding the best alternative routes possible. In this paper we show a way on how to deal with this overhead in an effective manner, allowing for the computation of high quality alternative routes while maintaining competitive query times.