Greensboro Police are investigating a crash that happened around 8:10 p.m. on March 21 in the 3600 block of Summit Avenue. Officers say four men were in an altercation in the roadway, outside a crosswalk, when they were hit by a vehicle. Three men were taken to local hospitals with serious injuries, and one was treated at the scene. The driver stayed and cooperated with police, and impairment is not suspected…