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California Division of Highways, July 1966. This accident statistical comparison developed the original idea for warrants for guardrail placement on roadway embankments, which are now embodied in the AASHTO Roadside Design Guide. Photocopy. Book, guardrail expert books,pavement edge drop expert, pavement edge drop off expert, work zone safety expert, construction zone safety expert, roadway hydroplaning expert, traffic engineering expert, traffic sign expert, traffic signal expert, pavement marking expert, highway safety expert