DALLAS (CBSDFW.COM) – Authorities are investigating a motorcycle crash that killed one on the Dallas North Tollway Saturday morning.

The crash completely shut down the northbound lanes of the DNT for hours after the wreck happened around 5:15 a.m.

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Highway patrol says it appears the motorcyclist was headed north and struck the concrete center median and a light pole. The driver was thrown from the bike and died.

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The victim has not been identified.

Troopers say several other vehicles then hit the light pole that was down across the road but there were no other injuries.

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Investigators are still trying to determine what caused the motorcycle driver to lose control.