A Pleasanton man whose vehicle launched 157 feet off a Livermore hillside Monday has been upgraded to stable condition and is expected to be released from the hospital Wednesday, the California Highway Patrol said.

Wanda Pelillo, 57, was killed in the crash that occurred at 3:01 p.m., when a car driven by her son Joseph Pelillo swerved off westbound Interstate 580 near Grant Line Road and went off an embankment over the Stonecut railroad crossing, Officer Kevin Bartlett said.

The small red sedan was driving fast enough that it flew 157 feet off the hillside, over the railroad tracks, into the opposite hillside and rolled down the hill before coming to a stop on its roof.

According to CHP Officer Joe Azevedo, original reports that a chair in the roadway may have caused the man to swerve have since been ruled out.

A big-rig driver who witnessed the crash pulled over before emergency crews arrived and walked down the embankment to find the mother and son trapped inside the car, Bartlett said. Alameda County Fire crews arrived shortly after and pronounced Wanda Pelillo dead at the scene before extracting her from the vehicle.

Joseph Pelillo, 22, was airlifted to John Muir Medical Center in critical condition, and is now considered stable, Azevedo said. The cause of the crash remains under investigation.


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Contact Erin Ivie at eivie@bayareanewsgroup.com. Follow her at Twitter.com/erin_ivie.