There's one on my way home. I sit with cruise set at 31mph and Waze showing a steady 30, and as I approach and pass the sign I get the following:
red 32
Angry face
green 30
smiley face
green 28
smiley face
green 27 as I pass it
Every time.
I suspect it's designed to do this to encourage all motorists to slow down regardless of their actual speed.
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