How to map Key:smoothness

The next picture I would like to put up for a vote is the one below. How would you tag the smoothness of this track?

  • intermediate (wheels) city bike, sport cars, wheel chair, Scooter and all below
  • bad (robust_wheels) trekking bike, normal cars, Rickshaw and all below
  • very_bad (high_clearance) Car with high clearance, light-duty off road vehicles
  • horrible (off_road_wheels) heavy-duty off road vehicles and all below
0 voters

Background: see the discussion here. Please read that discussion, add to it if you can, and then vote here. The issue basically is: should “Usable by” in the column header of the wiki table be interpreted as “comfortably usable” or “just passable” (or something in between…)?
FYI the photo has been used in the past to illustrate smoothness=very_bad, but in my opinion shows no obstacles for which high clearance would be an advantage.