Crashworthy Work-Zone Traffic Control Devices (2006) / Chapter Skim
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1CHAPTER 1 INTRODUCTION 1.1 RESEARCH PROBLEM STATEMENT FHWA requires that Category 2 work-zone traffic control devices used on the National Highway System (NHS) and purchased after October 1, 2000, meet the evaluation criteria in NCHRP Report 350: Recommended Procedures for the Safety Performance Evaluation of Highway Features.
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