In Colorado, they don't bother you, unless the crack is obscuring your vision - that is, it's at eye-level, on the driver's side. I just realized that BOTH my Sidekicks have cracked windshields. On my 4-door (daily driver), the last time I got a windshield put in, they didn't seal it along the bottom edge, but before I could get it back to them, it already had a crack. I think the fact that we often have days with a 50 degree swing in temperature makes it worse.