At least in Wales and parts of Scotland they put of a sign with a big 20 on it.
Germany if a town or village has a red line around the name it's 50kph anything slower they put a sign up.
It's easy to forget but I do have the satnag set to ping when over limits but that's not 100% reliable.
About us there was a blanket 20 introduced in all areas that were 30. Some bits on outskirts of towns they have now revised limits back to 30.
Over all it has definitely slowed traffic. People will still drive at over 20 just like people used to drive at over 30.
Germany if a town or village has a red line around the name it's 50kph anything slower they put a sign up.
It's easy to forget but I do have the satnag set to ping when over limits but that's not 100% reliable.
About us there was a blanket 20 introduced in all areas that were 30. Some bits on outskirts of towns they have now revised limits back to 30.
Over all it has definitely slowed traffic. People will still drive at over 20 just like people used to drive at over 30.