Highway Safety Manual applied in Missouri - freeway/software : research summary.
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Highway Safety Manual applied in Missouri - freeway/software : research summary.

Filetype[PDF-663.62 KB]


English
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Details:

  • Creators:
    Sun, Carlos
  • Corporate Creators:
    Missouri. Dept. of Transportation. Construction & Materials Division
  • Contributors:
    Stone, Bill
  • Subject/TRT Terms:
  • Publication/ Report Number:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • Corporate Publisher:
    Missouri. Dept. of Transportation. Construction & Materials Division
  • Abstract:
    AASHTO’s Highway Safety Manual (HSM)

    includes models for freeway segments, speedchange

    lanes (transitional area between mainline

    and ramps), ramps, and interchange terminals.

    These predictive models for freeway

    interchanges need to be calibrated to Missouri

    conditions. This calibration process requires

    detailed data types, such as crash frequencies,

    traffic volumes, geometrics, traffic control, and

    land-use. The calibration process also requires

    specific decisions on the correct sampling

    approach, determination of the influence area of

    terminals and interchanges, and how to locate

    crashes within the appropriate interchange

    facility.

    In order to obtain samples for each interchange

    facility type, every single freeway interchange

    in Missouri was catalogued according to HSM

    classification. This was done since the

    Transportation Management System (TMS)

    database does not classify interchanges

    according to the HSM definitions. Freeways in

    Missouri include interstates, US highways, and

    Missouri highways. From this master list of all

    Missouri interchanges, sample sites were selected randomly while maintaining

    geographical coverage across all seven MoDOT

    districts.

    HSM calibration is a data-intensive process that

    uses many types of data. One type is geometric

    data which involves the collection of

    characteristics such as lane width, shoulder type,

    median type, ramp skewness, horizontal

    curvature, and traffic control. Another type is

    AADT which is obtained by querying the

    MoDOT TMS database. A third data types is

    crash data which requires the detailed review of

    original crash reports, since crashes were

    frequently landed incorrectly.

    The project calibrated various Missouri freeway

    interchange facilities, including diamond, partial

    cloverleaf, and full cloverleaf interchange

    terminals, and ramps and speed-change lanes.

    Missouri interchanges can now be modeled

    using these calibration values with the HSM.

  • Format:
    PDF
  • Funding:
    DTRT13-G-UTC37
  • Collection(s):
  • Main Document Checksum:
  • Download URL:
  • File Type:

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