This article is from the California Driving (and Surviving) FAQ, by "George J Wu" georgewu@netcom.com with numerous contributions by others.
from gwu@esl.com (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.
 
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