Flat tire in the Big Dig tunnels

Last night on the way back home I got a flat tire, my first one in years.  I was driving on I-93 north into downtown Boston a little past midnight.  There was much construction going on, so the two right lanes were closed.  There was not much traffic. I'm just cruising along (below the speed limit, thank you very much), when all of I sudden I hear a bang and feel a jerk on the back right side of the car.  Sure enough, the tire pressure warning indicator lights up. Unfortunately I had to go a lit