Privacy is an issue on cramped trains and buses.
Casey Miner reports on the study for KALW:
"On the largest buses, seating about 80, technology use falls by more than a third when more than 40 people are on board," said Joe Schweiterman, one of the researchers on the study. "We hear endless complaints that the coach cabins of airplanes have become awful places to use technology," said Schwieterman."