ahead
alert
attention
barricade
barrier
block
boundary
caution
closed
construction
construction site
danger
detour
enclosure
equipment
fence
footpath
forbidden
hazard
industrial
infrastructure
maintenance
message
notice
obstruction
pathway
pavement
pedestrian
protection
reconstruction
repair
restricted
safe
safety
security
service
sidewalk
sign
site
stop
street
under
utility
walking
walkway
warning
work
yellow
zone