Alphabet’s Waymo self-driving vehicle subsidiary revealed a bit of its business strategy in an address Sunday by CEO John Krafcik, who said the company intends to develop its own sensors and software rather than rely on other suppliers, as most suppliers and automakers are doing. Krafcik, a former Ford and Hyundai executive, said at the press preview of the North American International Auto Show that Waymo had succeeded in lowering by 90% the cost of a $75,000 LIDAR sensor, which uses lasers to sense objects.