PLEASANTON -- One lane of southbound Interstate 680 is blocked after a two-car collision, authorities said.
Witnesses said one of the drivers collapsed outside of his car, and emergency crews are on scene.
The crash was reported about 1:40 p.m. just north of the Bernal Avenue exit. The left lane is blocked, with traffic backed up most of the to the 580 interchange, according to Sigalert.com.
Contact Daniel M. Jimenez at 510-262-2728. Follow him at Twitter.com/DMJreports.