auto
automobile
background
blue
cable
car
check
city
control
cross
danger
day
drive
engine
equipment
highway
light
maintenance
metal
modern
object
open
pole
protection
red
repair
road
safe
safety
security
semaphore
service
sign
signage
signal
sky
stop
street
symbol
technology
tool
traffic
transport
transportation
travel
urban
vehicle
warning
way
white