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I find that when using the site on a mobile device (android, iPad) it often seems to interpret a released touch as still being active, such that attempting to drag an existing point, for example, evokes a “pinch zoom” gesture instead. Not sure if this is a known problem.
It should be reasonably easy to implement a feature meaning that when the user mouses over (or taps on phone/tablet) 'traffic free' (for example), the corresponding parts of the route displayed on the map are highlighted somehow.
I realise that there is colour coding of the route path, but it's not always entirely clear to me.