Actually, I think that at those two tracks, they'd be overrun if they slowed to 150 in the turns!
At Daytona and Talladega you’re looking at speeds in the turns above 180 but top speeds are just a touch under 200.
Some of the shorter tracks have much higher straight speeds and lower turn speeds. at Michigan I’ve seen them enter turn one at speeds as high as 211 with turn speeds around 175.