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