asphalt
attention
backdrop
background
black
border
building
caution
construction
danger
design
diagonal
diamond
dirty
grunge
grungy
hard
hazard
hazardous
industrial
industry
iron
line
metal
metallic
notice
old
pattern
pavement
plate
problem
reflection
road
safety
sign
steel
street
striped
stripes
symbol
texture
traffic
transportation
wallpaper
warning
weathered
worn
yellow