Fiat Chrysler and Google have signed a deal to double the size of the tech giant’s fleet of self-driving cars.

The auto maker will supply 100 Chrysler Pacifica vans and provide engineers to help integrate the technology.

Fiat and Google described the deal as the most advanced partnership to date between Silicon Valley and a traditional auto maker.

Google wants to add more vehicles to its fleet to increase the amount of road testing it does.

Fiat CEO Srgio Marchionne has in the past raised also concerns about the tech industry’s impact on the auto makers.

Photo Google

Sergio Marchionne called tech companies moving into the sector “disruptive interlopers” and questioned the caliber of the vehicles they could produce.

John Krafcik, Google’s head of self-driving cars, said: “The opportunity to work closely with [Fiat] engineers will accelerate our efforts to develop a fully self-driving car that will make our roads safer.”

Google has said it believes driverless cars could be ready to goes on sale by 2020.

The announcement of the partnership came a week after Astro Teller, the head of “Moon Shots” at Google said the driverless cars project may soon move from under the umbrella of the Google X division that focuses on futuristic innovations and projects.

Google will own the Fiat cars, and both companies will be free to work with other companies to develop driverless technology.

The deal could propel Fiat to the head of the self-driving pack and position it to become a major manufacture for Google.