allow
background
black
caution
city
color
control
danger
design
direction
driving
electric
element
equipment
forbidden
forward
go
green
guidance
highway
icon
illuminated
illustration
intersection
isolated
lamp
light
neon
red
regulate
regulation
road
safety
semaphore
sequence
set
sign
signal
stand
stop
stoplight
street
symbol
traffic
transport
transportation
urban
warning
yellow