Port Authority of Allegheny County is the public transit agency for the greater Pittsburgh area, providing bus, light rail, incline and paratransit service to about 230,000 riders daily.
For bus service, pay as you enter when you're going toward Downtown and pay when you exit when traveling away from Downtown. This policy is in effect at all times on the light rail system, known as the "T" and until 7 pm. daily on buses. After 7 pm, bus riders must pay upon boarding.
You can transfer between the 28X (from the Pittsburgh International Airport) and most other Port Authority bus or "T" routes in downtown Pittsburgh. A transfer costs $1 and is good for three hours for a one-zone ride within city limits. Request a transfer from the operator before paying your fare. Exact change is required when paying your fare as bus drivers do not carry change.
Bus service between 4 am and 7 pm is FREE within the Downtown area known as the Golden Triangle. The Free Fare Zone includes stops within the Allegheny and Monongahela rivers to Ross Street, Penn Station and Liberty Avenue at the railroad overpass and 11th Street. Travel within Downtown and the North Shore is also free 24/7 on the "T," Pittsburgh's light rail system.