Calibration of Highway Safety Manual Work Zone Crash Modification Factors

dc.contributor.author Sun, Carlos
dc.contributor.author Edara, Praveen
dc.contributor.author Brown, Henry
dc.contributor.author Zhu, Zhongyuan
dc.contributor.author Rahmani, Roozbeh
dc.contributor.department Institute for Transportation
dc.date 2018-02-15T19:23:43.000
dc.date.accessioned 2020-06-30T04:51:32Z
dc.date.available 2020-06-30T04:51:32Z
dc.date.embargo 2015-01-29
dc.date.issued 2014-06-01
dc.description.abstract <p>The Highway Safety Manual is the national safety manual that provides quantitative methods for analyzing highway safety. The HSM presents crash modification factors related to work zone characteristics such as work zone duration and length. These crash modification factors were based on high-impact work zones in California. Therefore there was a need to use work zone and safety data from the Midwest to calibrate these crash modification factors for use in the Midwest. Almost 11,000 Missouri freeway work zones were analyzed to derive a representative and stratified sample of 162 work zones. The 162 work zones was more than four times the number of work zones used in the HSM. This dataset was used for modeling and testing crash modification factors applicable to the Midwest. The dataset contained work zones ranging from 0.76 mile to 9.24 miles and with durations from 16 days to 590 days. A combined fatal/injury/non-injury model produced a R2 fit of 0.9079 and a prediction slope of 0.963. The resulting crash modification factors of 1.01 for duration and 0.58 for length were smaller than the values in the HSM. Two practical application examples illustrate the use of the crash modification factors for comparing alternate work zone setups.</p>
dc.format.mimetype PDF
dc.identifier archive/lib.dr.iastate.edu/intrans_reports/88/
dc.identifier.articleid 1086
dc.identifier.contextkey 6583586
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath intrans_reports/88
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/44931
dc.language.iso English
dc.relation.ispartofseries InTrans Project 06-277; Iowa DOT TPF-5(081)
dc.source.bitstream archive/lib.dr.iastate.edu/intrans_reports/88/IADOT_SWZDI_UMC_Sun_Calibration_Highway_Safety_Manual_Work_Zone_Crash_Mod_Factors_2014.pdf|||Sat Jan 15 02:16:57 UTC 2022
dc.subject.disciplines Civil Engineering
dc.subject.keywords Countermeasures
dc.subject.keywords Crash data
dc.subject.keywords Geometric design
dc.subject.keywords Highway safety
dc.subject.keywords Traffic control devices
dc.subject.keywords Traffic signal timing
dc.subject.keywords Work zones
dc.subject.keywords crash modification factors
dc.title Calibration of Highway Safety Manual Work Zone Crash Modification Factors
dc.type article
dc.type.genre report
dspace.entity.type Publication
relation.isOrgUnitOfPublication 0cffd73a-b46d-4816-85f3-0f6ab7d2beb8
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