For a while this summer I was driving a relatively quiet motorcycle down in the Tampa/St. Pete area. I had a woman merge on top of me entirely because she was busy talking on her cell phone, not looking where she was going, and generally unaware that I was anywhere in the area. Of course, down there you have the added issue of hearing problems, since (as the locals say) 'Tampa is where everyone's grandmother goes to retire -- and St. Pete is where her mother lives.'
Lots of bicyclists and joggers, too.