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

File Language:
English


Details

  • Creators:
    Sun, Carlos ORCID ICON IMG
  • Corporate Creators:
    Missouri. Department of Transportation. Construction and Materials Division
  • Contributors:
    Stone, Bill
  • Subject/TRT Terms:
  • Publication/ Report Number:
    cmr 16-009;MoDOT project# TR201405
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States;Missouri
  • Corporate Publisher:
    Missouri. Department of Transportation. Construction and 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
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/31045/dot_31045_DS1.pdf
  • File Type:
    Filetype[PDF - 663.62 KB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha-512:da74a6ea2d02be620c2131ad5b0c87d2b134248dade05dd66ccefdf2e35e729bb7d48e53015f589ee787d5b05c75a1793e6b30efb93340b095e5255f0d1d0c8b
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