There’s an area that I drive maybe once a week that causes me to disable autopilot but its not tricky at all and I dont really understand whats happening. It happens when I’m on i66 in Virginia crossing above 495. The car knows the speed limit is 55 and I’ll have AP set to 67 and as I approach 495 the car will suddenly brake and I see that AP has lowered its max speed to 50. I then scroll the speed back up to 60 and a second or two later it brakes again and goes back to 50. Once I finish passing over 495 its back to smooth sailing on i66. My first thought was that there may be an error in the maps that reports the three lanes of i66 in this overpassas exit ramps and that is why speed reduces dramatically even below the speed limit? This occurs eastbound and westbound and its above the overpass so not like some of the other issues with shadows underneath overpasses. Any ideas?