WE are so rare in numbers that the thought pattern for minimum speed limits doesn't even come to mind most likely.
The ones that I do see stick in my head VERY clearly because of their rarity.
45mph on LA freeways, 45mph on I-15 near Ogden, Utah, and a 40mph min. on I-70 in western Kansas!
It's probably easier for the regulators to leave the dividing line between slower traffic, and too slow traffic to the individual officer's discretion!
I like a posted min. because I can count on it. It's a known reference line.
It's hard to go to a local grade school, and guess in your mind where the imaginary 3 point NBA line should be!
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