Interstate 540 Runs right through the middle of Fort Smith, Mostly you will see Troopers out there working it, usually you don’t see the City or the County officers out there. The posted speed limit is 65, most people do 80 or 85, they love to run laser in a few spots, in the last week or so I have seen a State Police Camaro running up and down the interstate during the day. At night you are safe as long as you are going south, if you are going north and you are weaving from lane to lane chances are you will get stopped by a State Trooper, Usually there are 6 or 7 out after midnight on the weekends so watch out..and be careful