I haven't counted, but the speed limit does change a fair number of times between 138 and "downtown."
I know because if I'm driving and my wife is in the car she reminds me of each change.
Faster where there are no homes, 45 when you reach the first houses, 35 when you hit down, 25 next to the school, etc.
I don't think those have changed since I moved here a decade or so ago.