The Kansas Highway Patrol has been doing a lot of enforcement on I-635 running radar in both directions. Northbound: they will usually hide behind the concrete barriers between Kansas Ave and the Missouri State Line. Most of this enforcement is due to the construction in the area. Speed limit is 65 until you get into the work zone, then it drops to 55. Southbound: Troopers will usually sit in the big median area just north of I-70. The helicopter will often assist the ground units in clocking motorists, especially during the late afternoon/early evening hours. If you drive through these areas, be careful!