I find my aluminum road racer and my mountain bikes don't trip the inductive sensors. Both of my steel commuter bikes do a great job but there's the one intersection where I do need to drift over into the center of the lane to trip it.

On casual evening rides I often take the faster fair weather commuter. It's kinda hilarious watching all the lycra clad racer wannabe carbon snobs trying to track stand for minutes at a time until the precise moment when I or one of my other "steel is real" friends catch up.