American companies led by Alphabet Inc.’s Waymo have drawn much of the limelight with driverless cars deployed almost entirely on home soil. Now that some are beginning to look abroad, they’ll have to share roads with Chinese companies quietly making plenty of progress.Baidu Inc.’s Apollo Go, WeRide Inc. and Pony AI Inc. are outnumbering their American counterparts with more robotaxi projects progressing from testing to various stages of commercialization, according to a BloombergNEF analysis. W...