Indeed, they already have a trial taxi app, Waze Carpool. Though right now they follow the UberPOP pricing model, at-cost rides. It has additional aspects that

Indeed, they already have a trial taxi app, Waze Carpool. Though right now they follow the UberPOP pricing model, at-cost rides. It has additional aspects that only work for commutes. For example, the rider has to wait at a pick-up point near a highway. That said, if they made any serious effort, they could likely gain significant market share. Uber and Lyft already did the hard work of lobbying and creating the demand for riding and driving. Google could swoop in and reap the benefits. It would require Google to do something novel for the company: have large distributed customer-facing operations.