First post!
Seriously though, I guess I'd have to agree with Sean. Even the new rider on the Harley may have been taking risks that were a little too high in general - I don't know how fast he happened to be going, but I know I routinely see guys going down two-lane rural roads at night as fast as they would during the day. Now maybe some guys have much better night perception than I do, but I'll say that for me I tend to back off some at night, finding my ability to judge exact distances and speeds not as precise in darkness than in the light of day, not to mention making reading the road ahead of you from a long way off that much harder. I believe it's called "out-riding your headlights".