[FrankJ]

My opinion is your sketch is not legal. Looking at Fig 4-2. You example is there & only legal if the bumper is longer than 8". Figure 2013-01-15 in the 1/15 update still requires 8" of bumper as measured from each exterior vertex. It just allows you to wrap that measurement another exterior vertex. That is my opinion of the update. Do realize it is the inspectors opinion is the that counts.

Other implications of this update. (At least to my meaningless opinion.)
Sides of the polygon do not have to be >8.
So round robot are now legal.
Unlike last year, 1" chamfers at the corners are legal.