The Member of the Senedd for South Wales East said: “The new blanket 20mph speed limit has been in place for just one day and already people have had enough of it.
“For more than 45,000 people to sign a petition within 24 hours shows the extent of public outrage towards Labour’s madcap policy.
“This highlights that there has been little to no consultation with the general public, the Labour Government have clearly avoided all public scrutiny in a bid to get their socialist agenda pushed through.”
The Welsh Government has suggested that it could take a month for drivers to get used to the new speed limits, with the intention being to educate rather than fine if they are going under 30mph.
A number of road safety organisations, including Brake and Living Streets Cymru, have signed a joint letter to back the rollout, saying it supports health, climate and societal goals.
Natasha Asghar MS added: “Labour and Plaid Cymru have refused to listen to public opinion and are continuing to wage their anti-worker, anti-road and anti-motorist agenda.