Aw shiiite - can't resist a quiz. Ok no cheating
1 If one fails, the other will work. So you stop
2 Something to do with balance? Or heat?
3 So you can get home on a night and the cops just see a bike if you position it right
4 Because the damn things misfire so much harder metals would break.
5 Judder. They love it.
6 Lawsuit for a failed cast wheel is a test case - could cost billions. Or eh, pass.
7 Burns
8 Motorways are straight. = more time. Unless you're hemmed in by trucks, might as well be a narrow road.
9 Moving trains around, duh.
10 Button below the wheel..