hello Richard, good job ! i ve tested it locally in Saint-Etienne and it works. I just suggest you to add an option to calculate a route that don’t take difficult climbings;

i’ve worked on a router based on routino http://www.routino.org/ that calculate the shortest route (like you) and the quickest route (asuming that the more difficult is the climbing, less speedy is the travel) the source is here : https://github.com/ocivelo/routino-2.6-bikeopposite-elevation for example, I took the travel from 5.4141,4.3955 to 45.4287,4.4005 to avoid “rue de la vivaraize” which is a difficult way for an everyday bike travel

unfortunately, I haven’t got a site on the web with thos routing available,