I had a long drive yesterday, with more than 200 miles on I-95, and used AutoPilot virtually the entire time. So I had a lot of opportunity to observe the "cartoon" vehicle display in the instrument cluster. One thing I had noticed before, and repeatedly confirmed yesterday, is that when the screen displays the rear side detectors detecting an object nearby, the front sensors almost never react to the same object or vehicle. In other words, as I passed another vehicle or another vehicle passed us, the screen would show the colored bands from the rear sensors, but the display never showed any colored bands for the front sensors for the same vehicle. Have other people observed this? And does anyone have an explanation? I know the front sensors work, because they are active when parking the car. But they rarely if ever "light up"for passing vehicles or objects. Maybe once in a while, the display shows they are reacting if a guard rail or other object is especially close to the car. But not most of the while when a vehicle passes. Obviously, my concern is whether or not the sensors are doing what they should during AutoPilot operation.