A big test is coming for Tesla as more automakers embrace electric vehicles. Several electric cars have been unveiled this week at the Frankfurt Auto Show, which is one of the world's most prestigious cars shows held every two years. 

KCBS Radio's Margie Shafer spoke with CBS News Automotive Reporter Jeff Gilbert, who is in Europe for the show. 

<p>A big test is coming for Tesla as more automakers embrace electric vehicles. Several electric cars have been unveiled this week at the Frankfurt Auto Show, which is one of the world's most prestigious cars shows held every two years.&nbsp;</p>
<p>KCBS Radio's Margie Shafer spoke with CBS News Automotive Reporter Jeff Gilbert, who is in Europe for the show.&nbsp;</p>

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