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By March 10, 2035, "the sum of (a) those who own cars and use them at least once a week (b) those who use a ride-sharing program with self-driving cars at least once a week, not counting twice those who do both will be less than 40% of the U.S. populatio

Created by JoshuaZ on 2015-03-10; known on 2035-03-10