Good guess, but it is for the grapes themselves. From Wikipedia:

Grapevine, California
Grapevine is a village located at the foot of a road grade known as The Grapevine through Tejon Pass in the Tehachapi Mountains at the southern end of the San Joaquin Valley along Interstate 5 (formerly U.S. Highway 99). The village consists mainly of roadside services. The village and grade are named, not for the once-winding road that used to climb the steep mountain pass, but for the wild grapes that still grow along the original road. The grade was infamous for its high accident rate before the road was straightened and widened. The road is sitll occasionally closed due to heavy snowfall during winter storms, and still has some car accidents. As the Grapevine is the major route between Northern and Southern California, any closure is a major disruption to traffic along the West Coast.

 

Similar, but not the same.