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NCHRP Report 794 Median Cross-Section Design ... NCHRP Report 794, Appendices 1 NCHRP Report 794...

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  • NCHRP Report 794, Appendices 1

    NCHRP Report 794

    Median Cross-Section Design for Rural Divided Highways

    Appendices

    Appendix A—2003 Survey Questionnaire

    Appendix B—2006 Survey Questionnaire

    Appendix C—Crash Sorting Codes

    Appendix D—Design and Testing of a Terrain Mapping System for Median Slope Measurement

    Appendix E—Economic Analyses

    Disclaimer

    These appendices to NCHRP Report 794 are uncorrected drafts as submitted by the research

    agency. Any opinions or conclusions expressed and implied in the appendices are those of the

    research agency. They are not necessarily those of the Transportation Research Board, the

    National Research Council, the Federal Highway Administration, the American Association of

    State Highway and Transportation Officials, or of the individual states participating in the

    National Cooperative Highway Research Program.

  • NCHRP Report 794, Appendices 2

  • NCHRP Report 794, Appendices 3

    Appendix A

    2003 Survey Questionnaire

  • NCHRP Report 794, Appendices 4

  • NCHRP Report 794, Appendices A-1

  • NCHRP Report 794, Appendices A-2

  • NCHRP Report 794, Appendices A-3

  • NCHRP Report 794, Appendices A-4

  • NCHRP Report 794, Appendices A-5

  • NCHRP Report 794, Appendices A-6

  • NCHRP Report 794--Appendices.doc 7

    Appendix B

    2006 Survey Questionnaire

  • NCHRP Report 794--Appendices.doc 8

  • NCHRP Report 794, Appendices B-1

  • NCHRP Report 794, Appendices B-2

  • NCHRP Report 794, Appendices B-3

  • NCHRP Report 794, Appendices B-4

  • NCHRP Report 794, Appendices B-5

  • NCHRP Report 794, Appendices B-6

  • NCHRP Report 794, Appendices B-7

  • NCHRP Report 794, Appendices B-8

  • NCHRP Report 794, Appendices B-9

  • NCHRP Report 794, Appendices B-10

  • NCHRP Report 794, Appendices B-11

  • NCHRP Report 794, Appendices B-12

  • NCHRP Report 794, Appendices B-13

  • NCHRP Report 794, Appendices B-14

  • NCHRP Report 794, Appendices B-15

  • NCHRP Report 794, Appendices B-16

  • NCHRP Report 794, Appendices B-17

  • NCHRP Report 794, Appendices B-18

  • NCHRP Report 794, Appendices 19

    Appendix C

    Crash Sorting Codes

  • NCHRP Report 794, Appendices 20

  • NCHRP Report 794, Appendices C-1

    C.1 Process of Categorizing Median Accidents

    C.2 California Accident Flags

  • NCHRP Report 794, Appendices C-2

  • NCHRP Report 794, Appendices C-3

  • NCHRP Report 794, Appendices C-4

  • NCHRP Report 794, Appendices C-5

  • NCHRP Report 794, Appendices C-6

  • NCHRP Report 794, Appendices C-7

    C.3 Missouri Accident Flags

  • NCHRP Report 794, Appendices C-8

  • NCHRP Report 794, Appendices C-9

  • NCHRP Report 794, Appendices C-10

  • NCHRP Report 794, Appendices C-11

  • NCHRP Report 794--Appendices.doc C-12

  • NCHRP Report 794--Appendices.doc C-13

    C.4 North Carolina Accident Flags

  • NCHRP Report 794--Appendices.doc C-14

  • NCHRP Report 794--Appendices.doc C-15

  • NCHRP Report 794--Appendices.doc C-16

  • NCHRP Report 794--Appendices.doc C-17

  • NCHRP Report 794, Appendices C-18

  • NCHRP Report 794, Appendices C-19

    C.5 Ohio Accident Flags

  • NCHRP Report 794, Appendices C-20

  • NCHRP Report 794, Appendices C-21

  • NCHRP Report 794, Appendices C-22

  • NCHRP Report 794, Appendices C-23

  • NCHRP Report 794, Appendices C-24

  • NCHRP Report 794, Appendices C-25

    C.6 Pennsylvania Accident Flags

  • NCHRP Report 794, Appendices C-26

  • NCHRP Report 794, Appendices C-27

  • NCHRP Report 794, Appendices C-28

  • NCHRP Report 794, Appendices C-29

  • NCHRP Report 794--Appendices.doc C-30

    C.7 Washington State Accident Flags

  • NCHRP Report 794--Appendices.doc C-31

  • NCHRP Report 794--Appendices.doc C-32

  • NCHRP Report 794--Appendices.doc C-33

  • NCHRP Report 794--Appendices.doc C-34

  • NCHRP Report 794--Appendices.doc C-35

  • NCHRP Report 794--Appendices.doc C-36

  • NCHRP Report 794, Appendices C-37

  • NCHRP Report 794, Appendices C-38

  • NCHRP Report 794, Appendices 39

    Appendix D

    Design and Testing of a Terrain Mapping System for Median Slope Measurement

  • NCHRP Report 794, Appendices 40

  • NCHRP Report 794, Appendices D-1

    D1. Introduction

    Median cross-section elements (e.g., width and side-slopes) are critical in determining the

    nature of crashes that occur in a median, and selection of cross-sectional elements requires

    tradeoffs: “flattened” medians may result in more crossover median crashes, while medians

    which have steep slopes might increase the probability of vehicle rollover. The makeup in the

    vehicle fleet has also affected aspects of this tradeoff, particularly in regard to rollover. In the

    past decades, consumers have purchased a significant number of Sports Utility Vehicles (SUVs)

    which have a greater propensity to overturn than some smaller cars. Increased travel speeds and

    traffic volumes on the nation’s highways also call to attention the need to make possible changes

    to the American Association of State Highway and Transportation Officials (AASHTO) policy

    on geometric design of highways and streets, a policy which has remained largely unchanged

    over the last many years (1). Median cross-section design also plays a pivotal role in the

    selection and evaluation of in-median corrective factors such as median barriers. In particular,

    the relative positioning of a median barrier in a median directly affects the nature and number of

    crashes that happen in the median.

    While there are a number of research pro

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