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.

(Bloomberg) — Tesla Inc. shares surged after the automaker rolled out its long-promised driverless taxi service to a handful of riders, a modest debut for what Elon Musk sees as a transformative new business line.

Tesla stock posted modest gains after Elon Musk's EV maker finally launched its robotaxi service in Austin, Texas to a small group of users on Sunday.