Our friends at Digital Artist Toolbox have been kind enough to provide this great Free download. The quality is terrific and I think that you should have no trouble finding some use for these.
Download the art, then visit the source to give thanks and explore their website from top to bottom. They are slowly building quite a resource for designers and illustrators.

“I’ve made a few vector road signs and a traffic light for you to add to your toolbox.  I had a lot of fun making them, especialy the traffic light.  I hope you enjoy and find good use of them. The zip file contains Illustrator 10 format and a EPS format.”

*Source: Digital Artist Toolbox