The California Highway Patrol shut down all northbound lanes of Interstate 15 just south of Oak Hill Road after 7:30 a.m. when two semi-trucks collided, causing a chain reaction of wrecks. The site is about 11 miles south of Hesperia in San Bernardino County.
http://www.latimes.com/news/la-me-cajon-pass11-2009jun11,0,4518393.story