It takes a minute for mine to adjust. I don’t do much riding through tunnels. I really like them because most of my workouts are at sunset or sunrise, and the transition is fast enough to keep up with the changing light conditions without having to stop and swap lenses. I also think they work great for trail use, as they get noticeably lighter if I’m in a canyon or forest with a little more shade and then darken right back up once I’m back in full sunlight.