advice
alert
attention
background
black
city
communicate
communication
cross
danger
direction
freeway
go
guide
help
human
icon
illustration
info
inform
life
man
mark
monochrome
pass
pedestrian
pictogram
public
restriction
road
route
safety
sign
silhouette
simple
speed
stop
street
symbol
traffic
transportation
urban
walk
walking
walkway
warning
way
white