I don't think you'll need to be concerned there Vince. As Nobster and Isynge state, as long as there is a disabillity card behind the screen, you shouldn't have any trouble. One of my good mates lives in a wheelchair and went with us to Le Mans the last couple of years and it appears that being in a wheelchair magically opens many doors and pathways.
I'll tell you, I've never before reached the fence of Arnage corner at 2 a.m. so fast as with him in front of me!
Everyone steps aside as if you are escorting the King himself.