A while ago I built a visualisation to display the orientation of roads in a defined area and had requests to have a similar view for activities. Well, two years on (I know!) and here it is, with the added breakdown by the gradient of the roads/trails. Just head to the “Breakdown” tab on any Activity, Route or Segment Details page. Filtering the selection in the top profile (Activity & Routes) updates the visualisation appropriately.
I think this falls more into the pretty to look at but only providing useful information to those really wanting to get into the real nitty gritty of a route perhaps when comparing against the potential wind directions etc.
There is a table of the corresponding data below the graphic.