alert
art
attention
background
barrier
black
boundary
caution
cone
construct
construction
danger
design
element
equipment
flat
forbidden
icon
icons
illustration
industry
isolated
line
marking
object
obstacle
outline
pictogram
plastic
repair
road
safety
security
set
sign
signal
site
stop
street
striped
summer
sweet
symbol
traffic
transportation
under
warning
white
work