Your concern is quite understandable. A couple years ago I was hit from behind on a road with a marked bike lane. It was a clear, sunny Sunday morning on a road with 35 mph speed limit and 4 travel lanes. It was the only car visible for a long way off. I could see in my mirror that the vehicle was staying in the right lane. It wasn't until I heard a big bang that I realized his fender had caught my handlebar. There was absolutely no reason why the driver could not see me and give more room. I had a flashing rear light and a safety flag. I wasn't hurt and the trike had minimal damage - broke mirror and a damaged bar end light. It spooked the hell out of me so while I didn't quit riding I did a lot less of it. I am now back to riding nearly every day during the cycling season (about 8 months long here) but it took a couple of years. You can't anticipate every possibility of getting in an accident but I am very cautious about turning vehicles and expect the possibility of having to do evasive maneuvers.