access

accessibility

approach

arrive

automatic

background

barrier

board

boundary

busy

city

close

commute

commuter

control

depart

destination

door

entrance

equipment

exit

gate

gateway

hand

human

inspection

leave

man

metal

modern

motion

octopus

pay

payment

people

public

stile

subway

system

technology

ticket

tourniquet

traffic

train

transport

transportation

travel

turning

turnstile

wicket