Two of the busiest bus routes in Louisville now have more frequent service, but funding for the improvements is only guaranteed for about one year. Transit Authority of River City buses will run every fifteen minutes on the number 18 route on Preston and Dixie highways and on the number 23 route, which serves Broadway and Bardstown Road. About 20% of TARC's riders use the two routes. The extra buses are being paid for with a $1 million federal grant. The grant will last for about one year. Last year, TARC had to cut routes to overcome a more than $5 million revenue shortfall. The authority relies heavily on occupational taxes, and the budget is affected by local job losses. TARC director Barry Barker and Mayor Greg Fischer will discuss the service changes publicly Tuesday morning.