The closure is expected to last for several hours, police said.
Service on the orange and green lines has been enhanced.
Traffic will be impacted Thursday through Saturday.
The construction is being done on weekdays, including lane closures.
BART had to single-track around the problem.
The CHP issued a sig-alert because several lanes were blocked.
Construction is scheduled to begin this summer.
A overturned big rig caused major backups.
The City seeks to relieve traffic congestion, reduce major traffic crashes, and adapt to new transportation technology.
A serious crash on the road has been cleared.
Here's how to lock-in one of those coveted spaces.
Give your input on station designs.
Two separate crashes are causing backups for morning commuters.
The slide is west of Palomares Road.