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Now that I think about it, what Caltrans does by posting a chain speed limit and then using the CMSs to announce the chain requirements (as well as changing some signs manually) effectively does change the speed limit wherever chains are needed. And if they only used the CMSs they could do it remotely. Dan Smith Principal The Tioga Group, Inc. 288 Rheem Blvd. Moraga, CA 94556 (925) 631-0742 fax (925) 631-7936