yellow
Jim [taking a written driving test]: Pssst. What does a yellow light mean?
Bobby: Slow down.
Jim: Okay. What...does...a...yellow...light...mean?
Bobby: Slow down!
Jim: Okay. Whaaaaaat...dooooooeees...aaaaaaaa...yeeeeeel-loooooow...liiiiiiight...meeeeeeeaaan?