A route navigation system for reducing risk of traffic accidents

We develop a navigation system considering traffic accident risk. After putting the start and goal points by a user, the system suggests a detour; a better route contains low risk against traffic accidents. Users can also contribute to register risk values to the dangerous points. We define cost functions to generate reasonable and safer route paths within the given geometrical area. The system was evaluated by examinees with field tests, then marginal reputations from them.