A 40-year-old motorcyclist died in a collision with a van early today on the White Horse Pike in Clementon.Clementon Lt. Charles Grover said the motorcycle was traveling west on the pike when it collided with the van, which was turning onto the highway from Atlantic Avenue around 6 a.m. The motorcyclist was pronounced dead at Kennedy University Hospital-Stratford. His identity is being withheld pending notification of his family. The driver of the van, a 29-old Clementon man and his 21-year-old male passenger, also of Clementon, were treated and released from Virtua Berlin, Grover said. He declined to release their names. There was no indication the van ran the stop sign, he said, but added that the accident was still under investigation.