10mph is not very fast at all, that's a comfortable running speed for most people and it's about right for moving through stationary traffic. You can stop on a dime at that speed, and any decent biker should have no problem. The motorbike in that gif is going much faster than that.
I do this every day and for many years, and never have I been anything close to having an accident because of it. That said, I don't lane split through moving traffic at all unless it's at a crawl, for the reasons demonstrated in 005's first gif, but I do straight overtakes if the oncoming lane is free.