I also say drive to a safe spot. Cycling should be fun, and if you're afraid, and understandably so due to circumstance, it's worth it to drive to a safer area. If you can, ride with someone. I live near one nice stretch of road that is as safe as it's gets around here, but sometimes, I just feel squirrely inside for no logical reason and am nervous to be on the road by myself. On those days, I either ride with people, which makes me feel more secure, or I don't go out at all. I've learned to respect my feelings and take care when I feel the need.