alert
attention
background
bright
caution
city
communication
concept
control
crossing
cutout
design
downtown
electric
equipment
go
going
green
help
highway
intersection
lamp
light
object
pace
pedestrian
post
public
red
regulate
regulation
road
safety
security
semaphore
sign
signal
signpost
speed
step
stop
street
symbol
town
traffic
transport
urban
walk
warning
yellow