off tracking diagram?

Easier way to prove all that--just go to any busy truckstop late at nite--you know the kind you can barely get to the fuel island for all the double and triple parked trucks in the driveway--stand there for a few minutes with him--then watch 2-3 freight haulers with sets--pull in up front where the cars go--(like they do all the time)make u-turns--park and go in and get coffee--then as they leave tell him to go do the same thing with his rig--might get it thru his head--LOL

 

Just tell him this proves it: Tractrix