Northbound traffic on Highway 99 is at a crawl near Panama Lane following a crash Tuesday morning.
CHP Officer Robert Rodriguez said a collision involving a big rig and a work truck caused the traffic jam.
Rodriguez said the work truck stalled on the 99 and was hit by a big rig at about 7 a.m.
All northbound lanes of the 99 were shut down, but two have been re-opened.
Rodriguez said all lanes should be clear by 10 a.m.
No injuries were reported in the crash.