This is found at on-ramps as you accelerate to highway speeds of 80 plus.
Usually, you come from a residential 50 zone and must speed up to 80 BEFORE you enter the highway’s first lane.
Drivers often notice this sign for the first time during their driving test day during the test!
You see the number 60 zooming by and ASSUME it’s a maximum speed sign.
Then they stay at 60 and fail.
This sign tells you the OPPOSITE.
You must go OVER 60 ASAP!
Great way to fail.