MASCO provides a free shuttle bus service for Longwood campus students commuting between Harvard Square and the Longwood Campus (the M2 LMA shuttle). To board, you must show your Harvard ID. Buses leave the Cambridge and Longwood Campuses every 10-15 minutes during peak periods and at least once an hour during the rest of the day, from approximately 7 a.m. to 11:30 p.m. The trip takes 20 to 30 minutes, depending on traffic and weather conditions. Call 617-632-2800 or consult MASCO’s web site, http://www.masco.org/transit/ptsm2.htm, for schedules and other information.