Should the Grapevine have been closed for nearly 24 ... The Tejon Pass is particularly vulnerable because of its steep hills and the number of big-rigs that travel on it, Etchebarne said.

Although the entire route of Interstate 5 from Castaic north to the San Joaquin Valley is frequently called the Grapevine, some say only the few steep miles from Fort Tejon to the bottom of the ...