Boston's streets grew out of colonial lanes and filled-in tidal flats, so very little of the city follows a grid. I-93 runs north-south through the middle, underground beneath downtown and out over the Zakim Bridge toward Charlestown and the North Shore, while its southern stretch becomes the Southeast Expressway toward Quincy and the South Shore. I-90, the Mass Pike, comes in from the west through Allston and the Back Bay and ends at the Ted Williams Tunnel to East Boston and Logan. Route 1A and the older harbor tunnels also feed Eastie, US 1 crosses the Tobin Bridge toward Chelsea and Revere, and I-95, still signed Route 128 by most locals, forms the outer ring.
For on-site repair, the neighborhoods matter more than the expressways. The Southeast Expressway and the Pike back up every weekday, and there is rarely a safe place to work on a tunnel approach or an expressway shoulder, so most jobs happen once the car is parked. Storrow Drive and Memorial Drive follow the Charles with low overpasses and limits on commercial vehicles, which is why service vans come in on the Pike, Columbia Road, Blue Hill Avenue and the VFW Parkway rather than the riverside parkways.
Logan International Airport sits across the harbor in East Boston, and its garages and economy lot are a regular service location. The MBTA's Red, Orange, Green and Blue lines and the commuter rail reach most neighborhoods, so plenty of drivers leave the car on their block and ride the T to work while it gets fixed.