also, today i was on this farly long down hill side-walk that is totaly striaght and noone walks on. not the best highspeed spot, but thier was a truck comin' down the street, i was on the sidewalk and i'm flying down the sidewalk, hunkered down on my mtn. bike, i was keeping up with this truck and coulda passed it if i had more road. I don't know what he was doing, 20mph 30mph, i hope 30 .