In the second incident of its kind this week a woman died after inexplicably walking onto westbound I580 in Livermore early Thursday morning.
The latest incident follows another, similar fatality on southbound I680 in San Ramon early Monday morning in which a woman with ties to Concord and Danville was hit while crossing from the right hand side of the freeway to the center divide at 12:55 a.m.
The victim was identified as Traci Lee Joiner, 54, of Livermore.
On Thursday, Joiner was observed by motorists in the center divide of westbound I580, apparently waving her arms and walking east in the middle lanes of the freeway until she was struck in the slow lane at 3:58 a.m.
Investigators subsequently said Joiner was struck and killed by an SUV driven by a 56-year-old Lathrop man after walking into the travel lanes early Thursday morning.
Investigators said the driver of the involved car pulled over at the scene. The freeway was briefly closed as the CHP investigated the incident, all lanes re-opening a little after 5 a.m.