alert
attention
beware
car
caution
child
college
cross
crossing
crosswalk
danger
dangerous
design
direction
education
element
forbidden
graphic
icon
information
isolated
label
logo
mark
message
notice
pedestrian
people
prohibition
red color
risk
road
road sign
safety
school
silhouette
simple
speed
square
stop
street
symbol
traffic
transportation
triangle
triangular
urban
warning
way
zebra