The danger you don't see
I am an avid cyclist. On trails, the experience is very different from riding beside moving traffic. On a roadway or painted bike lane, the vehicle approaching from behind is often the one I cannot evaluate. I cannot see whether the driver is looking down, drifting toward the shoulder, reaching for something, or simply has not noticed me.
On more than one occasion, a passing vehicle has come close enough that I felt I was almost clipped by a mirror. That experience is the basis for this discussion: facing traffic gives a cyclist visual information and, in some situations, time to react or move. That is a reason to ask the question - not proof that wrong-way cycling is safer overall.
