A 35-year-old man is dead after authorities say his motorcycle collided with another vehicle in Jennings County.According to police, Gerald Andrew Branam, of North Vernon, was riding his motorcycle on Aug. 12 on U.S. 50 near the intersection of N. State Road 3 when it crashed into the back of a vehicle that was stopped in traffic. Authorities say Branam, who did attempt to stop, was thrown from the motorcycle and received life-threatening injuries. The person in the other vehicle was not hurt in the crash.The North Vernon Police Department says bystanders attempted lifesaving measures on Branam at the scene until first responders arrived. He was then transported to the hospital, where he died.The crash investigation is ongoing with the help of a state crash reconstructionist, but authorities say environmental factors may have played a role in the wreck.Agencies that assisted in this incident include the Jennings County Sheriff's Department, Indiana State Police, North Vernon Fire Department, Jennings County EMS and Rescue, and Lucas Wrecker Service.