alert
attention
barricade
barrier
block
blocked
caution
city
closed
closure
construction
danger
detour
diversion
divert
hazard
highway
improvement
maintenance
metal
no
notice
obstacle
orange
red
repair
restriction
road
roadblock
roadworks
safety
sign
signage
site
stop
street
symbol
traffic
transport
transportation
travel
uk
urban
warning
work
yellow