Answer:
What is black and white and red all over?
What is always coming but never arrives?
Railroad Crossing, look out for the cars. Can you spell that, without any R's?
You bind me and I walk. You loosen me and I stop. What am I?
You can see it everyday, but cannot touch it at will. What is it?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?