3d
background
barrier
border
boundary
cartoon
caution
cautionary
closed
collection
construction
control
crossing
danger
forbidden
gate
halt
hazard
icons
illustration
indicator
infrastructure
isolated
light
obstacle
open
pathway
perimeter
protection
railroad
railway
red
road
set
shut
sign
stop
striped
symbol
system
tech
technology
traffic
train
transport
warning
white