Cars are far and away the biggest threat to my safety, and the source of all the harrassment I receive while out in public. I mean, every now and then some guttersnipe blurts out incoherencies at me, but that's not something to be afraid of.
I regard driving, in cities, to be an inherently anti-social activity. If you want a healthy community with safe and lively streets you got to be out in it, not sealed off in a protective cage.