Rescuers had to use the Jaws of Life for more than an hour to extricate the woman.
The Golden State (5) Freeway in Santa Fe Springs will be shut down at intervals over the weekend as part of a project to add lanes to the roadway and reconfigure the Alondra Boulevard bridge.
The driver allegedly hit a pedestrian at Alonda and Holly, near Thompson, and then fled.
Officials said a man was found dead Sunday in La Mirada.
Local commuters were directed Monday to detours following the closure of a portion of Alondra Boulevard in Santa Fe Springs.
Police are on the hunt for a masked robber who attacked a Bellflower store owner with a crowbar Wednesday.