The Declaration on Best Tyres is aimed at municipal and regional governments in order to hasten the implementation of Best Tyres.  An invitation to join and sign the Declaration has been sent to all potential participants in May EUROCITIES. A reminder was sent in Februari 2017.

The Cities or third Parties signatories to the Declaration on Best Tyres are Amsterdam and Rotterdam. Cities, regional and even national authorities or private parties that want to sign the Declaration can send the signed declaration to . The Declaration can be found here.