The van makes its way slowly but surely through the city streets, braking gently when a car swerves into its lane. The driverless technology from Nissan Motor Corp., which uses 14 cameras, nine radars and six LiDar sensors installed in and around the vehicle, highlights Japan's eagerness to catch up with players like Google’s Waymo that have taken the lead in the U.S. Japan, home to the world’s top automakers, has not kept pace with the global shift to autonomous driving, so far led by China and the U.S. But momentum is building.