I understand this is a tangent but you picked a really bad example. We should be trying to remove every single speed limit that we can.
If the design speed of a road does not match the speed limit of the road, people will drive the design speed, cops will learn to sit there all hours of the day waiting for people to mess up, and get ticketed. Instead of just putting up the speed limit sign, city planners should design for the road to be safe without need for the speed limits to be in place. This can mean things like reducing the width of a lane, could mean speed bumps, to purposeful non-straight sections.
If the design speed of a road does not match the speed limit of the road, people will drive the design speed, cops will learn to sit there all hours of the day waiting for people to mess up, and get ticketed. Instead of just putting up the speed limit sign, city planners should design for the road to be safe without need for the speed limits to be in place. This can mean things like reducing the width of a lane, could mean speed bumps, to purposeful non-straight sections.