There's a vast amount of results for shortest-path search on graphs that look like road networks. This was of course motivated by the application to route planning. If you're looking for a starting point, the literature list at http://i11www.iti.kit.edu/teaching/sommer2017/routenplanung/... is quite comprehensive and grouped by technique. It's a lecture at the group that developed the routing algorithm used by Bing Maps. I work one storey below them, at the group where the algorithm used by Google Maps was developed :)