Hope you don't mind me hopping on in here from the USA...

Prior to a steady "DON'T WALK" there is a flashing "DON'T WALK" to warn that one should not start crossing the street. I was once told that when one sees the flashing "DON'T WALK" it really means, "DON'T WALK...RUN!"

I recall hearing my cousin being quizzed on the traffic lights.

"Red?" "Stop."
"Green?" "Go."
"Yellow?" "HURRY UP!"

No wonder so many states are making the requirements more stringent for younger drivers to obtain a learner's permit!

P. S. If you want the official list of American signs, here's the link:
http://mutcd.fhwa.dot.gov/