A 23-year-old man was critically injured in an early morning single-vehicle crash in Waipio.

The crash occurred on the northbound lanes of the H-2 freeway at the Ka Uka Boulevard offramp at about 3:30 a.m. today.

Honolulu police said the motorist was traveling northbound on the freeway when he veered right onto a grassy shoulder and a ditch and struck a guardrail.

Honolulu firefighters responded and extricated the man from his vehicle.

Emergency Medical Services personnel took him in critical condition to a hospital.

Police said the man was wearing a seat belt at the time of the crash.

It’s unknown at this time whether speed, alcohol or drugs were factors.