Re: What a complete plonker!
Autopilot is capable of following the traffic in front, and around you.
Anything stationary is filtered out as noise. It essentially relies on someone in front of you slowing and the lane markings to know what it is doing.
In the case where there is a car in front of you that sees a stationary object (e.g. fire truck) in the lane in front of them and switches lane to avoid it, autopilot now sees an empty lane in front of you. It will therefore continue at the configured cruise-control speed. If the system had slowed you down (with the car in front slowing because of the hazard) it will actually accelerate you into the stationary object.