The very same thing happens with me in Noprth Florida while driving on Hwy 20. It's a repeatable experiment. Car immediately slows down from 55 to 20. Less frequently, the speed limit (35 mph) sign on another road is read as 5 MPH. I didn't think the cruise control could work below about 18 MPH, but twice, it has slowed toward 5 MPH before I was able to override the AutoPilot.

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