It's kinda funny how far off this thread went, almost instantly.
I well understand not threading the needle or crowding bicycles. I don't. Been known to torque off some cars by not passing a bicycle in a tight situation, like when a car is coming the other way. To the guy behind me honking his horn, sorry but I ain't passing until it's safe.
I well understand bicycles wobble. True, they hardly ever fall down, but they sure look like they will. I don't ever expect a bicycle to stay tight on the stripe. Sure, it's nice if they can, but most can't. I know I can't.
I well understand bicycles are slow. Especially going up hills. Spandex or not, bicycles are not fast.
I well understand family rides are wide. Especially with little kids. They love to pass mommy and daddy. And god do they wobble. I will cross a double yellow line to get way far away from families out on rides. And I stay way back, so the kiddies don't turn around to look.
What I am not so understanding of is a bicycle rider deliberately trying to cause a crash. Like the one the other day, he kept looking over his shoulder at me, watching me aproach. Once I got within a few feet of him, he very deliberately turned across my path specifically to force me to swerve hard and brake hard to avoid hitting him.
Like I said, I see this sort of deliberately dangerous riding quite routinely these days. That's why I could read yesterdays rider and knew what he was going to do. I was quite well prepared for him.
I happen to live on a favored road racing road. The local teams practice here. Innumerous times I can see them turning their heads to watch me, or some other car aproach. The rear rider will call out, and they will fan across the road, forcing the cars (or motorcycles, or even a farm tractor) to violently brake and swerve to avoid hitting them. When the vehicle passes, they will return to single file riding along the shoulder.
This is no accident or fluke, it's well orchestrated and quite deliberate on the part of the spandex wearing bicycle riders. I do not see it with the blue jean wearing casual riders or commuters.