Tesla launched its robotaxi service in Austin on Sunday as its Model Y vehicles drove around a select batch of riders who gave rave reviews about smooth, convenient rides that were available for the cheap price of $4.20 .

While no one was in the driver's seat of the Tesla robotaxis, a front-seat rider acted as a "safety monitor" during the trial.

By Aditya Soni (Reuters) -Tesla shares jumped 10% on Monday after the electric-vehicle maker started testing its long-awaited robotaxi service, a key step toward proving the technology that CEO Elon Musk has for years touted as a crucial driver of its lofty valuation.