The Martin Luther King Jr. East Busway is a two-lane bus-only highway serving the city of Pittsburgh and many of its eastern neighborhoods and suburbs. It was named after Martin Luther King Jr. in recognition of the eastern portion of the route's serving many predominantly African-American neighborhoods, such as Wilkinsburg and East Liberty. It is owned and maintained by Pittsburgh Regional Transit.

Bus rapid transit (BRT), also referred to as a busway or transitway, is a bus-based public transport system designed to have much more capacity, reliability and other quality features than a conventional bus system. Typically, a BRT system includes roadways that are dedicated to buses, and gives priority to buses at intersections where buses may interact with other traffic; alongside design features to reduce delays caused by passengers boarding or leaving buses, or paying fares. BRT aims to combine the capacity and speed of a light rail transit (LRT) or mass rapid transit (MRT) system with the flexibility, lower cost and simplicity of a bus system.