On my way home yesterday I was keeping an eye on traffic behind me and noticed a pickup truck coming up behind me and not moving over. I don't think the driver saw me till he got rather close. Any idea how to get drivers attention if they are coming up behind you and not moving over? This guy did move over and gave a long honk as he passed, but it was close enough that I was checking how much room I had to my right. Would waving my left arm have helped? I had two red blinkies going (probably not much help during the day) and wearing a bright yellow/green jacket and riding near the right wheel track.