I live near Byrnes High School in Duncan, SC. Main Street runs past the front of the school, and the speed limit drops from 35 mph to 25 mph at the school. When traveling southbound on Main Street Mo Model S detects the speed limit change, and drops the speed assist icon on the IC from 35 to 25 for maybe 100 feet, and then goes back to 35 while still in front of the school. This behavior happens consistently.
I thought this was an isolated local anomaly and I didn't report it; however, yesterday I was traveling north of Burlington, North Carolina, on a 55 mph rural highway and AutoSteer. When I approached a school the car dropped its speed due to the Autosteer limitation as soon as it passed the 35 mph school zone limit, but then a few seconds later it accelerated back to 55 before it had passed the school. This happened three times at three separate schools on my trip. It also failed to recognize another school speed limit entirely.
Later on the trip the car slowed for a change in speed limit on a rural highway and almost immediately resumed normal speed, but this was not a school zone. The instrument cluster speed assist icon showed false 55 mph speed limit signs as well.
I have refresh Model S, HW1 and firmware 17.18.50. The car was in for its 12,000 maintenance less than a week ago.