(Bloomberg) — Washington, D.C., drivers are the least knowledgeable in the U.S. about the rules of the road, a distinction held by New York state motorists in 2009 and 2010, according to a study by GMAC Insurance.  Drivers in the nation’s capital scored an average of 71.8 percent on tests, the insurer said. New Yorkers ranked 45th, scoring 75.3 percent. Kansans ranked No. 1 with 82.9 percent. The national average for the test was 77.9 percent, with below 70 considered failing, according to a statement today from GMAC Insurance, the carrier that American Capital Acquisition Corp. bought from GMAC Inc.

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