[4ndrewl]

aka "it's a speed limit, not a target"

[everfrustrated]

Begs the question why the symbol for a limit is in the (literal) shape of a target.

[4ndrewl]

Circular signs with a red outline are prohibition signs (ie you _must_ not do this).

Triangular signs with a red outline are warning signs.

[tengwar2]

Circular blue signs are orders (i.e. you must do this).