A road near my house changes from 60 to 50 km/h at a certain point. If I have the car's autopilot on, it goes at 60, then ~20 metres before the 50 sign it slows down to 35. The HUD still shows 60 at this time. Then the car reaches the 50 sign, the HUD updates, and it speeds up to 50 again.
I don't understand why this happens, consistently, along this one stretch of road!