India, Dec. 5 -- Waymo, the self-driving car unit of Google parent Alphabet Inc. (GOOG, GOOGL), said Wednesday that it has officially launched its first driverless-car service, Waymo One, in Arizona.

The company added that as self-driving technology is new to many people, it will proceed "carefully with the comfort and convenience of riders in mind." Initially, Waymo-trained drivers will supervise the Waymo One vehicles.

In a blog post, Waymo Chief Executive John Krafick said that the company will initially offer Waymo One to hundreds of early riders from its research program, who have already been using its technology.

Over time, the company hopes to make Waymo One available to more members of the public as it adds vehicles and drive in...