I meant there are many ready-to-use map UIs out there already, like the UI from OTP or valhalla itself. No need to reinvent the wheel. E.g. see https://valhall

I meant there are many ready-to-use map UIs out there already, like the UI from OTP or valhalla itself. No need to reinvent the wheel. E.g. see https://valhalla.openstreetmap.de/ https://valhalla.openstreetmap.de/ Or https://github.com/Qwant/erdapfel https://github.com/Qwant/erdapfel Or https://graphhopper.com/maps2 https://graphhopper.com/maps2 & https://github.com/graphhopper/graphhopper-maps https://github.com/graphhopper/graphhopper-maps (disclaimer: I'm a contributor there)