Seat belts likely saved the lives of two drivers who collided head-on in Dayton Tuesday.

The crash on Route 35 was reported about 11:30 a.m. after a Nissan Versa crossed the center line into oncoming traffic, slamming into a Toyota Corolla. The driver of the Nissan, Jessica Dilboy, 35, of Lyman, fell asleep at the wheel, police said.

The driver of the Toyota, Kim Hammersley, 65, of East Waterboro, saw the Nissan and attempted to avoid it by veering toward the shoulder. In the crash Hammersley broke a rib, and her passenger, 62-year-old Gary McNeill, had minor injuries.

Hammersley and McNeill were transported to Southern Maine Medical Center in Biddeford. State police spokesman Stephen McCausland said Dilboy was not charged. He had no information on whether police were investigating whether alcohol or drugs were involved; he also did not say what circumstances led Dilboy to fall asleep.