ERVING — A head-on collision of two vehicles on Route 2 Monday night sent four people to the hospital and caused traffic to be diverted for about an hour while responders cleared the road.

The injuries were not life-threatening, according to Erving Fire Chief Philip Wonkka, who said the cause of the crash is under investigation.

“Airbags and seatbelts save lives,” he said.

Emergency responders were called at about 7:20 p.m. to an area on Route 2 in the Farley section of Erving. Orange’s emergency departments responded, too, Wonkka said, and tow trucks were called to remove both vehicles.

Traffic was diverted via Holmes Avenue, which loops around the section of Route 2 where the accident had happened. At 8:20, Wonkka said it would take at most another half hour to clear the road.