On 18/12/2017 17:36, Nightjar wrote:

They are talking of 20mph zones. A 20mph speed limit can be reversed simply
by issuing the necessary traffic order and removing the signs. A 20mph zone
has to be designed to be self-enforcing, which means lots of traffic
calming measures.

It doesn't have to be: all of the recent 20mph zones in Lancashire just
have new signs on poles.

Those would also need to be removed and the roads
restored to their former condition to reverse a 20mph zone.

... and some stretches of roads reverted to 30mph after the locals
complained.