A woman whose car spun out and struck the center divider on westbound Interstate 80 was critically injured Tuesday night after emerging from her car and being struck by another driver, according to the California Highway Patrol.

Traffic on the freeway was briefly stopped when a medical helicopter landed to transport the woman to John Muir Medical Center in Walnut Creek.

The incident occurred at 9:20 p.m. when a car spun out and struck the center median near the Cutting Avenue exit, according to CHP Officer Peter VanEckhardt. The driver exited the vehicle to inspect the damage and was struck by an approaching vehicle.

A Sig alert was issued at 9:40 p.m. and all westbound lanes were shut down. CHP officials said around 10 p.m. that traffic on the eastbound side of the freeway had been restarted, but westbound lanes remained closed.

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