alert
announcement
background
barricade
barriers
board
caution
circle
closed
construction
data
dirt
dirty
display
floor
ground
information
note
old
orange
outdoor
place
present
presentation
repair
road
round
safety
screen
service
shape
show
sign
square
stand
sticker
surface
symbol
traffic
transport
transportation
truck
type
used
vehicle
warning
white
wood
work
write