I do it out of prudence. The routes I take going to-and-from work often require sudden stops as you hit traffic bottlenecks. I'd rather force them to back up no

I do it out of prudence. The routes I take going to-and-from work often require sudden stops as you hit traffic bottlenecks. I'd rather force them to back up now while I have room to avoid an actual collision, than be rear-ended later when I have to brake.