I agree with @zenvelo, the best roads to do this are out West. Do not speed along the East coast; the urban areas in the Northeast aren’t good places to speed, and cops are very alert and ready to bust you south of DC all the way to Florida.
In my experience, best (and easiest) place to exceed the speed limit and not worry too much about getting pulled over is anywhere in Nevada, outside of the Reno and Las Vegas areas (especially the Las Vegas areas- police monitor I-15 all the way into Vegas).
I can’t vouch for police presence (or lack thereof), but Nebraska outside of Lincoln and Omaha urban areas is deadly dull and the roads are flat and straight just about everywhere. You will want to speed, period, just to get out of there.