20
30
40
50
area
background
careful
drive
enforce
fifty
forbidden
fourty
highway
hour
kilometers
kilometres
km
law
limit
limitation
maximum
miles
mph
per
red
regulation
regulations
residential
restrict
restriction
road
roadsign
round
rule
safe
safer
safety
scheme
sign
signpost
slow
speed
speeding
stopping
street
thirty
traffic
transport
transportation
twenty
warning
white