This morning at 5am I was driving into work with AP engaged and when I went near a flashing yellow, the Driver Console flashed red stating "Take Control Immediately" and I noticed the speed limit icon had changed to a street light icon. I have never seen this happen before and was curious if this was part of a new firmware addition? I have gone through flashing yellows before on AP and never had this happen. Also, there was no prior indication for me to "place hands on wheel" before I approached the light.