Car companies come to Arizona to test their vehicles. Here’s why

It’s hard to miss the driverless car phenomenon that’s been growing dramatically in Arizona.
The state is a hub for testing self-driving vehicles. But the Grand Canyon State has had a privileged relationship with car manufacturers for decades.
Next spring marks the 25th anniversary of Toyota’s proving ground in Wittman. Ford, Chrysler, General Motors and Nissan, among others, also test vehicles in the desert surrounding Phoenix.
Richard Woodroffe, Toyota’s Arizona proving-ground manager, said the state’s weather conditions are the No. 1 reason why the facility was placed in the state. Consistent weather allows for year-round testing of vehicles, and low rainfall means minimal disruptions to their work.