Update: All lanes are now open. The big rig has been moved off the freeway.
Two lanes have been blocked eastbound on Interstate 80, as a big rig has overturned.
The big rig and it's trailer collided with a Cadillac SUV at I-80 and the Madison Avenue exit. Traffic is backed up this morning.
The drivers of both vehicles were not injured in the accident.
The story is developing.