Article updated: 11/5/2012 5:27 AM

Do you know your driving IQ?

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Know your signs. This one indicates a divided highway.

Bill Zars | Staff Photographer

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Keep right: The arrow on this sign tells you where to drive when you approach traffic islands or medians.

Bill Zars | Staff Photographer

Know your signs. This one indicates a railroad crossing.

Bill Zars | Staff Photographer

Study your signs before taking a written driving test.

About this Article

Columnist Marni Pyke can't believe she almost flunked the written test when renewing driver's license. There were 805,682 written driving tests given in 2011. Of those, 737,568 were passes, 68,114 were failures. You’re allowed to get six of the 35 questions wrong. Any more, and you flunk.