A morning crash and a separate injury collision slowed traffic across several East Bay corridors, including the Bay Bridge approach.
A Sunday afternoon collision left a motorcyclist dead, burned a Subaru, and forced traffic onto Constantia Road while crews cleared the scene.
California Highway Patrol is investigating the collision after one driver died and two people were hurt near Robinson Ranch Road.
A two-car collision at Naglee and Park avenues left one passenger dead and four other people hurt early Sunday.
The collision closed a lane and sent wreckage off the roadway as investigators worked to determine what caused the crash.
Authorities say investigators identified multiple alleged victims and are urging others to come forward.
Police say a speeding Lexus started the collision chain that shut down westbound Dublin Boulevard for hours.
A motorcycle shooting near California Avenue and a separate pileup near Ashland Avenue forced overnight closures on I-290.
CHP says investigators are still working to determine what caused the wreck near the metering lights.
Seven people were involved in the Saturday night collision, and investigators had not yet said what caused it.