bookmark
clearance
color
control
danger
design
direction
electric
element
equipment
forbidden
go
graphic
green
icon
illustration
intersection
isolated
label
light
object
office
paper
quality
realistic
red
regulate
road
safety
semaphore
sequence
shadow
sign
signal
stand
sticker
stop
stoplight
street
symbol
tab
template
traffic
transportation
urban
vibrant
warning
yellow