As you pass through South Vienna on US 40, the speed limit drops from 55 to 50. While the road is a wide divided highway with primarily local traffic, there are a handful of private driveway entrances onto US 40 and the SR 54 intersection (which, along with are the basic reasoning for dropping the speed limit), John Law will set up either at the SR 54 intersection or at the westside Corporation Limits. Keep your speed below 55 and you should be OK.