CHP came up with this Grapevine brochure:
http://www.dot.ca.gov/dist6/opsnowflake/guide.pdf
The Grapevine goes straight from open to closed - no chain control. Same with Cajon Pass, although the Tehachapi Pass (SR-58) does have the chain control signs ready, in my recollection (they are turned to the side when chains are not required).