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Pages 3-4

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From page 3...
... 3 S E C T I O N 1 1.1 Background The FHWA has, since 1985, designated 13 specific design elements as controlling criteria for roadway design (1, 2)
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... 4Research is needed to address key questions concerning the 13 controlling criteria and their application in current practice including the following: • What has been learned about the relationship between the controlling criteria and safety and operations? • Based on current knowledge, are highway agencies using the appropriate controlling criteria?

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