alert
attention
background
barricade
barrier
border
boundary
build
cartoon
caution
collection
cone
construct
construction
control
danger
equipment
fence
flat
forbidden
highway
icon
illustration
isolated
obstacle
orange
protection
reconstruction
repair
road
roadblock
roadsign
safety
security
set
sign
signal
site
stop
street
striped
symbol
traffic
transportation
warning
way
white
work
zone