access
area
attention
barricade
barrier
boundary
caution
closed
construction
contractor
danger
development
fence
forbidden
guard
hazard
industrial
information
limited
mesh
netting
obstacle
outdoors
perforated
plastic
prohibited
protection
public
rail
renovation
restricted
risk
safe
safety
sidewalk
sign
site
stop
street
tape
threat
unsafe
warning
wire
work
workplace
yellow
zone