activity
attention
barricade
barrier
block
border
boundary
closed
construction
danger
detour
fence
flat
forbidden
highway
hurdle
icon
improvement
industrial
industry
isolated
object
obstacle
protection
reconstruction
repairing
road
roadblock
roadsign
safe
safety
security
sign
site
stop
street
stripe
striped
symbol
traffic
transportation
under
waiting
warning
web
white
work
yellow