Details:

Creators:
Sun, Carlos
Corporate Creators:
Missouri. Dept. of Transportation. Construction & Materials Division
Contributors:
Stone, Bill
Subject/TRT Terms:
[+]
Calibration Data Collection Freeways Interchanges And Intersections Ramps (Interchanges)
Publication/ Report Number:
cmr 16-009 ; MoDOT project# TR201405
cmr 16-009 ; MoDOT project# TR201405 Less -
Resource Type:
Tech Report
Geographical Coverage:
United States ; Missouri
United States ; Missouri Less -
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):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:718243cd55091742c51564f1e5738515ccdff5df14c06d6c172791d450530988
Download URL:
https://rosap.ntl.bts.gov/view/dot/31045/dot_31045_DS1.pdf
File Type:

Supporting Files

• No Additional Files

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