SEATTLE (AP) — A judge on Wednesday blocked Tim Eyman’s $30 car tab measure from taking effect in Washington state while cities and counties challenge its legality, citing “substantial concerns” that the initiative’s description on the ballot was misleading.

Voters approved Initiative 976 earlier this month. It caps most taxes paid through annual vehicle registration at $30 and largely revokes the authority of state and local governments to add new taxes and fees.

The city of Seattle, King County, Garfield County’s transit agency and a coalition of cities across the state sued to stop the measure, saying it would eviscerate funds they need to pay for transit and road maintenance. It would cost the state and local governments more than $4 billion in revenue over the next six years, according to the state Office of Financial Management.