GM’s home state will become its third public road testing location, after San Francisco and Scottsdale, Arizona, according to GM CEO Mary Barra. The tests will involve a fleet of autonomous cars roaming around the Detroit area.”By adding Michigan to our real-world testing program, we’re ensuring that our AVs can operate safely across a wide range of road, weather and climate conditions, from desert heat to Great Lakes snow to crowded city streets,” Barra wrote in a blog post.Indeed, varied driving conditions are critical to training the artificial intelligence algorithms that process data from self-driving cars’ sensors. Both startups and established automakers alike have developed a variety of approaches to racking up enough hours and miles to train their computers. Honda is using a mock city built in an abandoned naval weapons station in California, while Ford has invested in a startup that aims to make an AI-friendly map of every road in America. Last year, it was also the first carmaker to test autonomous vehicles at the University of Michigan’s simulated urban environment, Mcity.