When you click on a trail segment, the trail segment is highlighted and a dialog with the trail segment's properties appears. Here you will find information about length, when the trail was prepared, and properties.
You can also filter all skate trails by going to the menu in the upper left corner and selecting "Skøytetrase"
In the picture below,"Skøytetrase" is selected.
The picture below shows all the trails where it is possible to go both classic and skating.