This article is from the California Driving (and Surviving) FAQ, by "George J Wu" email@example.com with numerous contributions by others.
from firstname.lastname@example.org (George J Wu) on 7 March 1994:
The best source of current highway information is CalTrans' touchtone
hotline. From a touchtone telephone, call them at 1-800-GAS-ROAD. Then
punch in the number of the highway in which you are interested, followed
by a '#' key.