Found it! https://strava.github.io/iD/#background=MAPNIK&map=2.00/0.0/0.0 https://strava.github.io/iD/#background=MAPNIK&map=2.00/0.0/... zoom in a lot to enab

Found it! https://strava.github.io/iD/#background=MAPNIK&map=2.00/0.0/0.0 https://strava.github.io/iD/#background=MAPNIK&map=2.00/0.0/... zoom in a lot to enable the strava heatmap, and you can edit openstreetmap if you know what you are doing.