Shouldn’t I Be Grandfathered In

There is a stretch of US 1 & 78 that runs between Aiken and Augusta that they recently lowered the speed limit on from 55 MPH to 45. Myself, being a law abiding citizen, I slow down to 50 from 60 when I reach here. No one else does, they just keep barreling along. You can’t miss the signs, there are even “Reduced Speed Ahead” signs wih two orange flags popping out the top to warn you. Still no one slows down. What will they tell the cop? “Well, I used to drive 60 MPH through here before, shouldn’t I get grandfathered into being able to still go 60?”