Answer:
arbitration.
Explanation:
Arbitration is a method for resolving conflicts and disputes, without having to go to court.
Both parties involved in the dispute agree to present their arguments to a arbitrator or a group or arbitrators referred to as an arbitral tribunal. Both parties in dispute also agree to uphold and respect the decision that the arbitrator makes. The role of the arbitrator is to decide which party is right and decide what actions must be taken to favor that party. Arbitrators award a decision in favor of one of the parties, and that decision must be upheld by both parties.
In this case, the city council will act as the arbitral tribunal and decide whether the union or the transit authority is right.