Highway shoulder. Also, an oxymoron - the last place you want to break down in greater Boston is in the breakdown lane, especially during rush hour, when it becomes the high-speed lane (in some places, even legally). The state has built a series of emergency turn-outs along Rte. 128 so you can pull out of the breakdown lane if, in fact, your car breaks down.
Are car is dying, get into the breakdown lane