accident
alert
attention
background
barrier
block
boundary
build
caution
cone
construct
construction
danger
design
equipment
flat
forbidden
highway
icon
illustration
isolated
logo
marker
object
obstacle
orange
plastic
prevention
protect
protection
red
repair
road
safety
security
set
sign
signal
stop
street
stripe
striped
symbol
traffic
transport
transportation
warning
white
work