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UNITED STATES - MARCH 15 - Sen. Bill Nelson, D-Fla., asks for permission to engage while testing the Tesla Model S 90D, during an exhibition of self-driving cars for the Senate Committee on Commerce, Science, and Transportation, on Capitol Hill, in Washington, on Tuesday, March 15, 2016. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - MARCH 15 - Sen. Bill Nelson, D-Fla., asks for permission to engage while testing the Tesla Model S 90D, during an exhibition of self-driving cars for the Senate Committee on Commerce, Science, and Transportation, on Capitol Hill, in Washington, on Tuesday, March 15, 2016. (Photo By Al Drago/CQ Roll Call)

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