The answer is not what I thought it was. How could I possibly have been racing all this time and not understood this?
I thought that the passer got the right to the line after completing the pass. But the correct answer seems to be that you get the right to the line once passee’s front wheel has fallen back to passer’s driver.
Scenario. You are slowly pulling up to Joe on a straight. You then have overlap, but no right to be there. Then you get your front wheel up to Joe and you earn “racing room”. Then front bumpers are even. 1sec later your front bumper is out in front by 12" and YOU NOW HAVE THE RIGHT TO THE LINE. IT IS JOE THAT HAS ONLY “THE RIGHT TO RACING ROOM”.
25.4.3 Right to the Line
The driver in front has the right to choose any line, as long as they are not considered to be blocking. The driver attempting to make a pass shall have the right to the line when their front wheel is next to the driver of the other vehicle.
This is paragraph is probably goofed. I’ll try to get us clarification. 25.4.3 seems to be at odds with Appendix A, Example 8 below. In order to synch with CCR Appendix A, example 8, the paragraph above would need to read something along the lines of…
25.4.3 Right to the Line <Scott’s version>
The driver in front has the right to choose any line, as long as they are not considered to be blocking. The driver attempting to make a pass shall have the right to the line when the passee’s front wheel has fallen back to the passer’s door.
In a scenario where passer is trying to take a corner away from someone else, this means that the passer gets to choose any line he wants thru the turn as soon as he gets his bumper 12" in front or so. I’m saying 12" because if your bumper has moved 12" in front of mine, then my front wheel has fallen back to your door. This means that passee is pretty much required to give the turn up if passer gets a little bit ahead.
Appendix A has a number of diagrams of specific incidents. Example 8 shows this scenario. I couldn’t copy the diagram into a post so I made the example an attachment. Note the text explicitly states that the trigger for B owning the line is that A’s (passee) front wheel is no longer at B’s (passer) door.