abstract
accident
alert
attention
background
banner
barricade
barrier
block
caution
city
closed
cone
construction
control
danger
equipment
fence
forbidden
hazard
hurdle
icon
illustration
industrial
industry
isolated
maintenance
no entry sign
obstacle
protection
reconstruction
repair
road
roadblocks
roadsign
roadwork
safety
security
signal
stop
street
striped
tape
traffic
under
vehicle
warning
work
worker
works