A 33-year-old motorcyclist died in a single-vehicle crash in Windward Oahu Thursday, Honolulu police said.

The crash occurred in the area of Kamehameha Highway and Hunaahi Street at about 2:45 p.m.

Police said the motorcyclist was traveling eastbound on the highway at “a high rate of speed” when he lost control, veered off the roadway and struck a guardrail.

The 33-year-old man was thrown onto the roadway upon impact. He was pronounced dead at the scene.

Police said speed was a factor in the crash. It’s unknown at this time whether drugs or alcohol were contributing factors.

This is the 54th traffic-related fatality on Oahu this year compared to 46 at the same time last year.