DETROIT — General Motors Co. on Monday began testing its new, mostly self-driving technology on Michigan and California highways.

Trained drivers are behind the wheels of 200 test vehicles to take over if necessary, according to the Detroit automaker. GM said it's been collecting data from test vehicles driven in 34 states over the last six months in preparation.

A spokesperson declined to provide additional details on where testing will take place in Michigan and California.

GM has promised to launch "eyes-off" driving beginning in 2028 on its premium, all-electric Cadillac Escalade IQ. GM's goal is a mostly self-driving vehicle that can operate safely even if the driver falls asleep.

"Real-world testing is essential to build a trustworthy system," according to a release from the company. "Data captured during this phase will feed directly back into GM's development cycle, improving perception models, planning systems, and overall system robustness."

The technology builds off GM's current Super Cruise offering, which includes hands-free assisted driving, automatic lane changes and adaptive cruise control that shifts speed depending on surrounding traffic.

GM leaders are pushing self-driving for personal-use vehicles after pulling out of the robotaxi business in late 2024. The automaker shuttered its Cruise autonomous vehicle unit after an incident in which one of the self-driven cars hit and dragged a pedestrian on a San Francisco street.

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