Well, I am no attorney, so I don't know for sure. I do know that a person must provide ample warning when entering a crosswalk. I believe that is a walking pace. From California: "A pedestrian should not suddenly leave a curb, or other place of safety, and cross into the path of a vehicle as this creates an immediate hazard. "
That's a "should". I do know that cyclists may increase their liability if they ride at bike speed into a crosswalk like at 24th and Amazon.  I got that from the City. 
I would also venture that the fine for hitting  a pedestrian in a crosswalk is failing to yield right-of-way.  Just a ticket. No big deal. Unless there is a civil suit. Then you'd better have really good insurance.