A 20-year-old bicyclist was critically injured after a truck hit him in Pearl City this morning.

Honolulu police said a Nissan truck driven by a 29-year-old man was traveling westbound on Kamehameha Highway when the truck collided with the bicyclist at the Lehua Avenue intersection at about 7:20 a.m.

The 20-year-old was riding his bicycle northbound on Lehua Avenue and crossing the highway against a red palm signal at the time of the collision, police said.

The Nissan driver was not injured and remained at the scene.

Emergency Medical Services personnel treated the bicyclist who sustained extensive injuries and took him in critical condition to a hospital.

Police temporarily closed one westbound lane on the highway and two left turn lanes in the eastbound direction of the highway at the Lehua Avenue intersection to investigate.

All affected lanes have reopened.

Police said speed, drugs or alcohol were not factors in the collision.