Pittsburgh sits where the Allegheny and Monongahela rivers meet to form the Ohio, and its roads are a tangle of bridges, tunnels and hillside ramps. I-376, the Parkway, runs east through the Squirrel Hill Tunnel toward Monroeville and west through the Fort Pitt Tunnel toward the airport. I-279, the Parkway North, crosses the Fort Duquesne Bridge and heads toward the North Hills, and I-79 runs along the western edge toward Cranberry. The Pennsylvania Turnpike crosses the northern suburbs.
PA 28 follows the Allegheny River northeast, US 19 and Route 51 serve the South Hills, and the Liberty Tunnel links the South Hills with downtown. The tunnels are notorious bottlenecks: traffic slows as drivers enter them, and a breakdown inside a tunnel or on a bridge with no shoulder stops everything. Locals expect the slowdown at every tunnel entrance, especially the Fort Pitt Tunnel inbound, where the skyline suddenly appears at the other end. The city's many bridges and steep, winding streets make even short trips slow.
Pittsburgh International Airport sits west of the city, reached by the Parkway West. Pittsburgh Regional Transit runs buses, busways and the T light rail to the South Hills, and the Monongahela and Duquesne inclines climb Mt. Washington. Oakland's universities and hospitals and the downtown office towers draw heavy daily traffic, and weekday mornings bring a crush of inbound cars at every tunnel and bridge.
For a mobile mechanic, Pittsburgh is defined by its hills. Many homes sit on steep streets with sloping driveways or no driveway at all, some houses are reached only by city steps, and older neighborhoods have narrow streets with tight parking. The mechanic plans for a level spot and safe parking before starting work.