PITTSBURGH (KDKA) — Four times per year, Port Authority adjusts their service schedule and those adjustments went into effect today.

Among the adjustments was the return of the 21, a route from between Coraopolis and Neville Island.

Additional stops and trips have been added to three different routes including 67 – Monroeville, 87 – Friendship, and P71 – Swissvale Flyer.

A complete list of adjustments can be found here.