One of the things you see where I live is they pave roads with lower speed limits with rougher surfaces. You can drive 60km/h on a 30km/h road, but it'll be very uncomfortable.
People will drive as fast as comfortable or as they feel is safe. Making roads less comfortable at high speed is not hard. Making roads feel dangerous at high speeds while still being safe is not hard.
You can't just put up a speed limit sign and expect it to work. You have to adapt the design of the road to the speed limit.
One of the things you see where I live is they pave roads with lower speed limits with rougher surfaces. You can drive 60km/h on a 30km/h road, but it'll be very uncomfortable.
People will drive as fast as comfortable or as they feel is safe. Making roads less comfortable at high speed is not hard. Making roads feel dangerous at high speeds while still being safe is not hard.
You can't just put up a speed limit sign and expect it to work. You have to adapt the design of the road to the speed limit.