Some roads in Wales will revert to 30mph following backlash at the Welsh government's £34m default 20mph policy.
Transport minister Ken Skates said the changes will address the concerns that "a lot of people" have raised "on a consistent basis".
"We've put our hands up to say the guidance has to be corrected," he said.
Swansea council leader Rob Stewart welcomed the change, but said the government must help foot the bill to swap signage.
Mr Skates highlighted the almost half a million signatures to a Senedd petition opposing the policy, brought in under former first minister Mark Drakeford and his transport minister Lee Waters.