The crash was reported at 6:53 a.m. the motorcyclist was pronounced dead at the scene. Police said the motorcyclist was traveling in the fast lane and the truck was in the slow lane. Traffic investigators said the truck made a u-turn crossing over the fast lane and did not see the motorcyclist.
Officials say preliminary evidence gives clues as to who may have been at fault.
"Anybody making a u-turn from a slow movement of traffic and crossing over to a fast lane of traffic is obviously putting other motorists at danger and that would be considered an illegal u-turn," said San Jose Police Lt. Paul Messier.
The driver of the truck stayed at the scene and is cooperating with investigators. At this time, authorities do not believe drugs or alcohol were a factor. Both drivers have not been identified.