Roughly 38 million Americans—or 18.4% of drivers on the road—would not pass a written drivers test exam if they were to take one today, according to results of 2010 GMAC Insurance National Drivers Test.

The average national exam score was 76.2% in 2010, down nearly 2 points from the 78.1% scored in 2008. Any score below 70% is considered failing.

Drivers in the Northeast are not as road-rule savvy as their Midwestern counterparts: The Northeast had the lowest average test scores (74.9%) and had the highest failure rate (25.1%), whereas the Midwest region had the highest average test scores (77.5%) and the lowest failure rates (11.9%).

Below, other results of the GMAC Insurance National Drivers Survey.

Most Knowledgeable Drivers in Kansas, Least in New York 

After dropping to fourth place last year from its No. 1 ranking in 2008, Kansas regained the top spot this year with an average driving exam score of 82.3%. New York drivers ranked last for the third time in the survey's six-year history (70.0%).

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