I would also just like to reiterate what someone already wrote: make sure the motorists actually see you.

Last weekend, I almost got T-boned while making a left turn. I had the right of way. There was only one car and me anywhere near the intersection. He was stopped at a stop sign, and I saw him turning his head and waiting, looking both directions more than once. I was in a bright yellow jacket on a clear day. I had been in a long and well-marked turn lane for 75-100 yards, with my yellow arm sticking straight out in a constant signal.

I thought he was being careful, and I made a stupid mistake: I was going about 25 mph (down off a slight hill), and I kept approaching the intersection fast because (1) I thought he saw me and I didn't want to keep him waiting too long for me...I was trying to be polite, and (2) I had seen he was at a full stop and really looking back and forth, and I assumed he saw me. DUMB. He did not see me, and because I was going fast, I really had to maneuver when he started to pull out to hit me.

I swerved and really yelled at him (out of fright and reaction, really), and I could see by his expression that he was chastened...he wasn't angry...he just had not seen me, for some reason, despite my full yellow jacket, turn lane, and signal.

I was chastened, also. From now on, I will go slower and make the cars wait until I am SURE they have seen me. I'm glad I didn't learn it the hard way.