Cambridge has no interstate of its own, but it sits between several. Memorial Drive follows the Charles along the city's southern edge, Route 2 arrives from Arlington at Alewife and runs down Alewife Brook Parkway, where it shares pavement with Route 16, and then Fresh Pond Parkway toward the river. Route 28 runs as the O'Brien Highway past Lechmere into East Cambridge. Massachusetts Avenue is the spine of the city, linking Porter, Harvard and Central squares with MIT and the Harvard Bridge to Boston. The Mass Pike passes just across the river in Allston, and I-93 is a short hop from East Cambridge.
Driving here is slow but short. The squares are congested most of the day, one-way streets loop in ways that baffle visitors, and the Longfellow, River Street and BU bridges funnel traffic into a handful of crossings. Breakdowns tend to happen in that traffic or on the parkways, which have few shoulders. Most repairs, though, take place where the car normally lives: a permit spot on a residential street, a driveway beside a two-family house or a garage under an office building in Kendall.
The Red Line runs from Alewife through Davis, Porter, Harvard, Central and Kendall, and the Green Line reaches Lechmere and on into Somerville, so many people here keep a car mainly for weekends and leave it parked for days. That pattern is why so many service requests start with a car that simply won't start after sitting.