aged
alert
attention
beware
black
caution
construction
danger
dangerous
dig
digger
digging
dirt
dirty
gray
grey
grungy
human
keep out
man at work
men at work
photo
red
repair
road
road sign
road works
roadwork
safety
scratch
scratched
sign
street
symbol
under
under construction
urban
warning
work
work in progress
worker
working
yellow