An automaker like General Motors Co. brings two advantages to the development of self-driving vehicles: knowledge of how to build a car and the factories to do it. Silicon Valley’s biggest entrants into autonomous vehicles, particularly Alphabet Inc., have legions of coders and piles of cash.

Waymo is teaming up with Jaguar Land Rover on autonomous vehicles, its second major automaker partnership and a big boost for the nascent technology that has come under scrutiny recently.

It’s getting to be a traffic jam. Alphabet Inc.’s autonomous vehicle division Waymo began this month operating an autonomous freight truck in the Atlanta area, carrying server equipment, racks and related material to Google data centers.

Waymo, a unit of Alphabet Inc., got a permit in late January from the Arizona Department of Transportation to operate as a Transportation Network Company, according to Ryan Harding, a spokesman at the state agency.