allow
background
blue
city
color
colorful
column
concept
control
cross
crossing
crossroad
danger
drive
empty
environment
forbid
free
go
green
information
junction
left
light
no
object
only
red
right
road
safe
safety
set
sign
signal
sky
space
stop
street
symbol
three
town
traffic
trafficlight
transport
transportation
travel
turn
urban
walk
warn
way
yellow