As the U.S. ramps up its focus on autonomous driving, companies like Tesla Inc. TSLA, Alphabet Inc.'s GOOGL GOOG Waymo, as well as Amazon.com Inc.'s AMZN Zoox are driving the sector forward.But the real beneficiaries of this trend, if executed successfully, could be ride-hailing platforms like Uber Technologies Inc. UBER and Lyft Inc. LYFT. Let's break down why.Cost SavingsOne of the biggest advantages of autonomous taxis over traditional ride-hailing lies in economics. By eliminating the need for a human d ...