It's mostly safety for me, plus a good dash of comfort thrown in, as to why I don't ride on the road any more. I only ever really did 'the twisties' on the weekend anyway, and the combination of a long, boring ride to get anywhere, plus lower and lower speed limits on the good bits, plus the ever-increasing police presence and higher penalties, plus crazy drivers, poor road conditions and the high risk of dying on the road, and it's just not that appealing any longer. I could never just 'commute'..... every red light was a wheelie opportunity, and speed limits just feel waaaay too slow (unlike in the car, where I'm very law-abiding and happy to cruise around on the limit).

Re traffic... just focus on the good bits of the car (music, aircon, bluetooth phone calls, aircon, rain protection, sun protection, aircon) and ease of use (no change of clothes, no carrying a helmet around, wearing dragging jeans everywhere in 42 degree heat, rain suits, can't wear work clothes, and not being able to carry shit) and it's a no-brainer.

Don't get me wrong though. If I didn't thrash a racebike around the racetrack every two weeks or so, I'd go insane! And I'd have to ride on the road.