Way too little info from the o.p. (deliberately?) for y'all's to be whipping yourselves into such a froth to compose cogent responses. Even urban speed limits are challenging to achieve for a cyclist on level ground. On downslopes it might be possible but for law enforcement to get interested the average cyclist has run out of nerve. There would have to be some clearly displayed recklessness accompanying the speed limit violation to result in a pull-over situation.