A 61-year-old motorcyclist was critically injured after he crashed into a guardrail in Makiki Thursday.

Police said a BMW motorcycle was traveling westbound on the H-1 freeway when he struck the guardrail at about 5:20 p.m.

He was taken in critical condition to a hospital. Police said he was not wearing a helmet at the time of the crash.

Speed, alcohol or drugs were not factors.