A 21-year-old motorcyclist was critically injured in an accident Saturday morning on the H-1 freeway in the westbound lanes before the Ward Avenue overpass.

Police said the motorcyclist was traveling on the H-1 in the third lane, when he rear-ended a Toyota driven by a 23-year-old woman, who was stopped in traffic.

The motorcyclist then collided with a Chrysler driven by a 31-year-old woman in the fourth lane, which had also stopped in traffic.

The drivers of the two vehicles were uninjured and remained at the scene.

Emergency Medical Services administered treated the man and took him to a hospital in critical condition with head injuries.

The accident occurred at 9:04 a.m. and snarled traffic for miles as officers from the Vehicular Homicide Section investigated.

Speed was not a factor in the collision, but it was unknown whether drugs or alcohol contributed to the crash, police said.