Everything I've ever read has said it's about a wash, leaning slightly toward being more safe for riders. It's not safe (or necessary) to sit in traffic and be

Everything I've ever read has said it's about a wash, leaning slightly toward being more safe for riders. It's not safe (or necessary) to sit in traffic and be rear-ended or run over. It's also not safe to create a large speed differential with traffic. That said, it sure makes commuting more reasonable. I'm for it.