access
activity
attention
barricade
barrier
block
boundary
build
caution
closed
construction
danger
design
entry
equipment
fence
forbidden
highway
icon
illustration
industrial
isolated
maintenance
object
obstacle
protection
reconstruction
repair
restrict
road
road construction
roadblock
roadsign
safety
security
sign
stop
street
striped
symbol
traffic
transport
transportation
warning
web
work
worker