BURLINGTON (AP) - The organization that operates public bus service in Vermont's largest county says union drivers aren't working.

The drivers in Chittenden County decided last week to strike Monday after they rejected a contract offer.

The Chittenden County Transportation Authority has offered to resolve contract disputes with the union through binding arbitration, a neutral dispute resolution process using a third-party arbiter. It said the union needs to put a counterproposal on the table for negotiations to continue.

Rob Slingerland, a spokesman for the Teamsters Local 597, said the strike was set for Monday morning. He did not immediately respond to a message seeking an update.

The union represents nearly 70 bus drivers who've been seeking a better contract since last April.

The drivers carry about 9,500 people per day.