Ross B. Sudbrook, 23, is facing four charges, including first-degree assault, after what police say was a road rage incident that led to an alleged stabbing and car crash in Gambrills. (Anne Arundel County police)

The incident began when the driver and passenger of a 2002 Ford Explorer exchanged seats at an intersection, according to police. Ross B. Sudbrook, a passenger in a 2007 Chrysler PT Cruiser, got into an argument with the driver of the Explorer. When both vehicles then arrived at Route 3 North and Reidel Road, the 44-year-old driver of the Explorer exited his vehicle again and began to argue with Sudbrook, 23.

The argument escalated, ending when Sudbrook allegedly stabbed the driver of the Explorer in the upper body. Sudbrook and a 22-year-old female who was driving the PT Cruiser then fled north in the vehicle, police said.

The driver of the Explorer followed the PT Cruiser north toward Gambrills, forcing both vehicles off the road when they collided in a drainage ditch near a Honda dealership at Route 3 North and Churchview Road. After the crash, Sudbrook again confronted the driver of the Explorer and began fighting him. The driver of the Explorer eventually subdued Sudbrook, holding him at the scene until police arrived, an official said.

Sudbrook and the driver of the Explorer were both transported to the Maryland Shock Trauma Center in Baltimore, though their injuries are not life-threatening. Three other people — the driver of the PT Cruiser and two passengers in the Explorer — went to local hospitals. None of their injuries were life-threatening.

The crash forced police to close the northbound side of Route 3 for a short time about 4 p.m. while they investigated the incident. Police said that although they continue to investigate the case, it does not appear that the people in the vehicles knew one another.

After Sudbrook was released from Shock Trauma, police said he was charged with first- and second-degree assault, reckless endangerment and carrying a dangerous weapon with the intent to injure.