Ohio uses airplanes! Had a Red Mercedes as a front door last year on I-70 east of Columbus. Thought I was safe with 1/2 mile margin. Saw his brake lights, slowed down, and was shocked when the trooper waved me over as well. Got me for 83 in a 70. So when you see a wide stripe in the emergency lane beware. That's the "markers" the plane uses to clock by.