HaHa! I tried a few months ago. I was visiting friends who work at a LBS and they just got in the new Specialized Turbo electric assist bike in stock (Specialized Turbo Electric Bike Review - YouTube). They forced me to take a test ride and advised me that if the high speed on the computer was not at least 30mph when I returned they would make fun of me big time. So they set it on the fastest mode and sent me out the door. Within a few blocks I got the feel for the thing and saw a cop turn onto a cross street with a 20 MPH speed limit. So I thought "let's see if I can at least get pulled over". I turned on the street behind them and put as much power on the pedals as I could. I FLEW past them. I was actually scared on the thing. It was REALLY fast. But alas...no lights or sirens.

When I returned to the bike shop they checked the speedometer high speed. 40.0 mph! No one made fun of me. I gave the Turbo five stars.

20mph over the speed limit used to warrant a felony charge in Louisiana. Might still be in effect but i can't find Internet evidence. So I am happy I didn't get stopped.