The gentleman in this video claims to hit 30 mph while sledding down Birmingham's Crestwood Boulevard. I have no idea whether or not this is true, but knowing the intersection he's sledding past (I used to live right near there), it would certainly be a hell of a ride down a long stretch of steady grade. Other context that makes this video more fun: Crestwood is (as the "boulevard" implies) a multi-lane, divided small highway that's usually filled with cars going 55 mph in a 40 mph zone. The fact that this man is not hit by a car is a testament to how much the city has been shut down by the recent snow and ice.
Oh, and, finally, all those people going "wooo!" as he passes are standing outside of the neighborhood bar. Natch.