Self-driving cars are moving from sci-fi fiction to reality. Waymo -- the self-driving division of Alphabet (NASDAQ: GOOG) (NASDAQ: GOOGL) -- is a first mover in this emerging trend that could change billions of lives for the better. Waymo enjoys a massive technological lead over its rivals, as the company has poured time and money into this opportunity.However, doubts have surfaced regarding the viability of Waymo's self-driving cars.