background

black

changing

city

color

colour

control

danger

design

direction

driving

electric

electricity

equipment

forbidden

front

green

highway

illuminated

image

intersection

lamp

light

motivate

motivation

order

plight

red

regulate

road

safety

semaphore

sequence

shiny

showing

sign

signal

speed

stop

stoplight

street

symbol

traffic

transport

transportation

travel

urban

warning

yellow