I lane share quite often, and I always have the bags on. But there should never be a problem, since the mirrors are wider than the bags anyways. In fact, since the bags are also lower than the mirrors, the only annoyance I feel when lane sharing is that my mirrors are the same height as most car mirrors. So it takes a bit more "clearance" for them, than I need when going by pickups and such. But at least I know that if the mirrors clear, I KNOW I'm good. And these days, it seems like EVERYONE drives the guzzler SUV's...