Appraisal of the interactive highway safety design model's crash prediction and design consistency modules

Case studies from Pennsylvania

Eric Todd Donnell, Francis Gross, Brandon P. Stodart, Kenneth S. Opiela

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The interactive highway safety design model (IHSDM) is a suite of software analysis tools used to evaluate safety and operational effects of geometric design on two-lane rural highways. IHSDM checks existing or proposed two-lane highway designs against relevant design policy values and provides estimates of a design's expected safety and operational performance. This paper describes efforts to apply IHSDM to two existing rural roadways (one an arterial and the other a collector) in Pennsylvania and to compare the crash prediction and speed profile results to observed speed and crash data for these same two roadway segments. When considering both case study roadways together, the use of site-specific crash history data, adjusted using the empirical Bayes procedure, and a county-level calibration factor, produced crash frequency predictions that most closely matched the observed crash frequencies. The design consistency module output on the arterial roadway closely matched the observed speeds. On the collector roadway, the predicted and observed speeds did not match closely, thus, underscoring the need to expand the design consistency module capabilities to consider low-speed, complex alignments.

Original languageEnglish (US)
Pages (from-to)62-73
Number of pages12
JournalJournal of Transportation Engineering
Volume135
Issue number2
DOIs
StatePublished - Jan 28 2009

Fingerprint

Highway engineering
history
performance
Calibration
Values
software

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Transportation

Cite this

@article{d49c19c1321d4f4f90051d03d3cc4eed,
title = "Appraisal of the interactive highway safety design model's crash prediction and design consistency modules: Case studies from Pennsylvania",
abstract = "The interactive highway safety design model (IHSDM) is a suite of software analysis tools used to evaluate safety and operational effects of geometric design on two-lane rural highways. IHSDM checks existing or proposed two-lane highway designs against relevant design policy values and provides estimates of a design's expected safety and operational performance. This paper describes efforts to apply IHSDM to two existing rural roadways (one an arterial and the other a collector) in Pennsylvania and to compare the crash prediction and speed profile results to observed speed and crash data for these same two roadway segments. When considering both case study roadways together, the use of site-specific crash history data, adjusted using the empirical Bayes procedure, and a county-level calibration factor, produced crash frequency predictions that most closely matched the observed crash frequencies. The design consistency module output on the arterial roadway closely matched the observed speeds. On the collector roadway, the predicted and observed speeds did not match closely, thus, underscoring the need to expand the design consistency module capabilities to consider low-speed, complex alignments.",
author = "Donnell, {Eric Todd} and Francis Gross and Stodart, {Brandon P.} and Opiela, {Kenneth S.}",
year = "2009",
month = "1",
day = "28",
doi = "10.1061/(ASCE)0733-947X(2009)135:2(62)",
language = "English (US)",
volume = "135",
pages = "62--73",
journal = "Transportation engineering journal of ASCE",
issn = "0733-947X",
publisher = "American Society of Civil Engineers (ASCE)",
number = "2",

}

Appraisal of the interactive highway safety design model's crash prediction and design consistency modules : Case studies from Pennsylvania. / Donnell, Eric Todd; Gross, Francis; Stodart, Brandon P.; Opiela, Kenneth S.

In: Journal of Transportation Engineering, Vol. 135, No. 2, 28.01.2009, p. 62-73.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Appraisal of the interactive highway safety design model's crash prediction and design consistency modules

T2 - Case studies from Pennsylvania

AU - Donnell, Eric Todd

AU - Gross, Francis

AU - Stodart, Brandon P.

AU - Opiela, Kenneth S.

PY - 2009/1/28

Y1 - 2009/1/28

N2 - The interactive highway safety design model (IHSDM) is a suite of software analysis tools used to evaluate safety and operational effects of geometric design on two-lane rural highways. IHSDM checks existing or proposed two-lane highway designs against relevant design policy values and provides estimates of a design's expected safety and operational performance. This paper describes efforts to apply IHSDM to two existing rural roadways (one an arterial and the other a collector) in Pennsylvania and to compare the crash prediction and speed profile results to observed speed and crash data for these same two roadway segments. When considering both case study roadways together, the use of site-specific crash history data, adjusted using the empirical Bayes procedure, and a county-level calibration factor, produced crash frequency predictions that most closely matched the observed crash frequencies. The design consistency module output on the arterial roadway closely matched the observed speeds. On the collector roadway, the predicted and observed speeds did not match closely, thus, underscoring the need to expand the design consistency module capabilities to consider low-speed, complex alignments.

AB - The interactive highway safety design model (IHSDM) is a suite of software analysis tools used to evaluate safety and operational effects of geometric design on two-lane rural highways. IHSDM checks existing or proposed two-lane highway designs against relevant design policy values and provides estimates of a design's expected safety and operational performance. This paper describes efforts to apply IHSDM to two existing rural roadways (one an arterial and the other a collector) in Pennsylvania and to compare the crash prediction and speed profile results to observed speed and crash data for these same two roadway segments. When considering both case study roadways together, the use of site-specific crash history data, adjusted using the empirical Bayes procedure, and a county-level calibration factor, produced crash frequency predictions that most closely matched the observed crash frequencies. The design consistency module output on the arterial roadway closely matched the observed speeds. On the collector roadway, the predicted and observed speeds did not match closely, thus, underscoring the need to expand the design consistency module capabilities to consider low-speed, complex alignments.

UR - http://www.scopus.com/inward/record.url?scp=58549095279&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=58549095279&partnerID=8YFLogxK

U2 - 10.1061/(ASCE)0733-947X(2009)135:2(62)

DO - 10.1061/(ASCE)0733-947X(2009)135:2(62)

M3 - Article

VL - 135

SP - 62

EP - 73

JO - Transportation engineering journal of ASCE

JF - Transportation engineering journal of ASCE

SN - 0733-947X

IS - 2

ER -