PLEASANTON (BCN) — A motorcycle rider is dead following a crash involving a big-rig and possibly another vehicle Wednesday morning on westbound Interstate Highway 580 in Pleasanton, a California Highway Patrol spokesman said.

The collision occurred around 7:50 a.m. just west of Hopyard Road, CHP spokesman Officer Tyler Hahn said.

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A view of the fatal crash scene on westbound Interstate 580 west of Hopyard Road in Pleasanton. (CHP)

A Sig-alert was issued and the left two lanes are blocked on westbound Highway 580. The CHP does not have an estimate for when the lanes will reopen.

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CHP officials suggest using Interstate Highway 680 or state Highway 84 as alternate routes.

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Source: sanfrancisco.cbslocal.com.