Why isn't there a universal method for representing the terrain and difficulty of bike paths/routes in the form of a graph like the one below? ____________________etc. _____________/ / ____/ _____/ That way, one could become familiar with the basic configuration of a ride that is comfortable for him/her and compare it to the visual representation of another ride. The depth and duration of climbs can even be represented by crosslines on the graph. Has this already been done? Am I just naive?