Not for points Danish to English Other Slang

The context:
"I Århus stiger man ind bag i de offentlige busser, hvilket får mange til ”at køre på røven” – at lade være med at betale"

I have thought of translating it as either "Piggybacking" (but that refers more to internet connections)

or as "free riding" (but that has more of an mountain biking connotation)