Delaware State Police say around 2 a.m. on Saturday morning, a Toyota Rav-4 was traveling westbound on John J. Williams Highway, east of William Street Road. A Volkswagen Jetta was also traveling westbound, behind the Toyota. For reasons still under investigation, the Volkswagen rear-ended the Toyota, then drove off the roadway and struck a tree. The Toyota also veered off the roadway because of the collision.