ahead
alert
asphalt
barricade
barrier
block
blockade
blocked
caution
closed
closing
construction
danger
detour
diversion
divert
end
entrance
equipment
frustration
hazard
highway
industrial
metal
nobody
notice
obstacle
obstruction
outdoors
red
repair
road
roadblock
roadworks
sign
signal
site
street
symbol
temporary
traffic
transportation
travel
urban
warning
white
work
working