Ключевые слова: 18, 19, 20s, 30s, african, american, black, bus, business, businessman, california, call, caucasian, cell, commuter, commuting, female, five, friends, frustration, getting, group, horizontal, journey, male, men, message, milan, mobile, old, on, outdoors, passenger, people, person, public, queue, reading, ride, sanfrancisco, sending, smartphone, stop, suit, teen, teenager, text, texting, thirties, tram, transport, transportation, twenties, waiting, women, year,