abstract
architect
architecture
barrier
cap
cone
construction
danger
engineer
estate
forbidden
hardhat
hat
helmet
help
human
isolated
man
occupation
orange
page
people
person
planning
professional
puppet
repair
repairing
return
road
safety
security
sign
site
solution
stop
street
striped
symbol
tool
traffic
under
waiting
warning
web
white
work
worker
yellow