You just reminded me of an incident that happened to me on I83 near the PA border - a motorcyclist passed between me and the vehicle in the left lane (yes ... a two-lane road passing on the dashed line) going about 120 MPH. It wasn't the cycle passing at high speed very close to the car that scared me ... it was that I never saw him/her in my mirrors and the noise between two cars that were 4 feet apart was horrendous. I actually made me flinch at the wheel and I probably swerved a foot in my lane.

I've known many conscientious motorcycle drivers but it's people like this that lead to emergency room doctors referencing "donorcycles".