Increased licensing charges and new cab emission rules have seen over a thousand Wakefield taxi drivers join forces launch legal action against the council.
The changes see those driving vehicles made before 2016 unable to get a license - as their cars will now exceed the new pollution levels set by the authority.
The Wakefield District Private Hire and Hackney Carriage Association has sent a pre-action letter to the authority - which has until Monday (12th March) to respond.
Co-chair Wajid Ali says he just wants the council to sit down with drivers to discuss their concerns.
Bernadette Livesey, City Solicitor for Wakefield Council, said: “The taxi association has written a letter and the Council is currently considering its response.”