A big-rig overturned on Highway 101 in San Francisco, spilling debris and snarling traffic as the evening commute was just starting, according to the California Highway Patrol.
The crash occurred on a northbound 101 overpass at Bryant Street, and authorities were asking people to avoid the area, as debris from the spill also was falling onto streets below.
The truck appeared to be carrying a dry cement or gravel.
All northbound 101 lanes were blocked at Ninth Street, and the CHP issued a Sig-alert at about 4 p.m.
The CHP said the closure could be up to four hours.
No further details were immediately available.
This post was originally posted at http://www.nbcbayarea.com/news/local/Overturned-Big-Rig-Shuts-Down-NB-101-in-San-Francisco-CHP-509084901.html.