allow

architecture

car

change

city

cloud

color

control

controller

crossing

crossroad

danger

direction

drive

electric

equipment

green

guidance

highway

illuminated

information

intersection

junction

lamp

law

light

object

red

regulate

regulation

road

route

safety

semaphore

sign

signal

sky

stop

stoplight

street

symbol

town

traffic

transport

transportation

urban

warning

way

yellow