the automatic toll sensors use the magnetic loop in the pavement.
when I was on the sporty it would never pick up the bike, so stopped carrying the ez pass box with it. down side was I could not use the automatic gates.
I find that if you are not dead center of the lane on the rocket, the loops do not get a good magnetic reading on the bike, or I should say bikes. girlfriend and me ride thru side by side, it does not regester either of us, and that with her on the harley.
and yep, we did the slowed down speed to boot.