No Traffic # 1

Today, we were driving in CT, and turned a corner, and saw this sign, and the vehicle on the road, and decided you had to see it.

Ok ... just what is that pick up, if not a vehicle.  And what is the Vehicle doing, if not driving on a road. And what is the road doing there, if vehicles are not supposed to drive on it.  And why is there a stop sign, if vehicles are not supposed to be there?