Waymo will become the first robotaxi provider in the US to offer driverless rides on highways, a milestone that positions it to better compete with ride-hailing companies and traditional taxi services.Beginning Wednesday, the Alphabet Inc. unit will begin offering some riders routes that include freeways in San Francisco, Phoenix and Los Angeles, it said in a statement. Freeway service will be available 24 hours a day. Users who have opted in to Waymo’s new services and features will be the firs...