Give them no reason to pull you over. Run lights, mirrors and a horn and wear a helmet even if you're in a state with a no-helmet law. Don't ride on the sidewalks for any reason.
I weigh 225 and on my 29" rim'd bike I used a 56 tooth gear. Two main reasons: I have hills to climb here and to keep it under a 30 MPH to speed. Most of the time under 25 MPH.
I have been observed many times by city police and county sheriff deputies and at most all they do is glance at me. Luckly those that have gone before me have paved the way. If there are other riders in your town most likely the same will happen to you. Just do nothing to draw their attention