Changes

Eventually, you probably want to get on to I-90 (the Mass Pike). This goes right into downtown Boston, so find a busy onramp downtown.  From South Station there is an on-ramp not too far away with a traffic light and space to pull over. The biggest problem is that there is limited traffic and probably most of it is local. But you should hopefully be able to get to the service plaza in Framingham from here. From the station cross the street (Atlantic Ave.) and keep heading away from it--west. You should go through China town. After a few blocks, turn left (it doesn't matter so much how far you go before you do). That should take you to Marginal Way, which parallels I-90. Turn right, and follow it until it turns into an on-ramp. That's the spot.  If you're in the suburbs already, a tempting spot to start might be by the Riverside MBTA station, but you'll probably find very little traffic going your way. If you can get a short ride just as far as one of the [[rest area|service plazas]], you'll likely have much better luck.