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Page 62
Suggested Citation:"Abbreviations." National Academies of Sciences, Engineering, and Medicine. 2022. Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers. Washington, DC: The National Academies Press. doi: 10.17226/26679.
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Page 62
Page 63
Suggested Citation:"Abbreviations." National Academies of Sciences, Engineering, and Medicine. 2022. Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers. Washington, DC: The National Academies Press. doi: 10.17226/26679.
×
Page 63
Page 64
Suggested Citation:"Abbreviations." National Academies of Sciences, Engineering, and Medicine. 2022. Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers. Washington, DC: The National Academies Press. doi: 10.17226/26679.
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Page 64

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62 AADT annual average daily traffic AASHO American Association of State Highway Officials AASHTO American Association of State Highway and Transportation Officials ADOT Arizona Department of Transportation ADT average daily traffic AFT Accelerated Failure Time (model) AIC Akaike Information Criterion ALT alternative shielded median AP capital recovery factor BCR benefit-cost ratio BIC Bayesian Information Criterion Caltrans California Department of Transportation CASS Trinity’s cable safety system CIF cumulative incidence function CMC cross-median crash CME cross-median event CO cross-over-the-center line/cross-over (crash) CRR Competing Risk Regression (model) DC direct cost DOT Department of Transportation EFCCR equivalent fatal crash cost ratio FHWA Federal Highway Administration FO fixed object FOHE first and only harmful crash events HCM Highway Capacity Manual HT high tension IBC intermediate bulk container ICER incremental cost-effectiveness ratio ISPEs in-service performance evaluations KA fatal and serious injury (crash scale; term of art) LB longitudinal barrier LL log likelihood LON length of need LT low tension LW lane width MaineDOT Maine Department of Transportation MASH Manual for Assessing Safety Hardware MC annual maintenance cost Abbreviations

Abbreviations 63   mph miles per hour MLE maximum likelihood estimate MRE median-related event MVM million vehicle miles MVMT million vehicle miles traveled NA not available NB northbound NCHRP National Cooperative Highway Research Program NDRF non-designed roadside feature NTSB National Transportation Safety Board NULL alternative unshielded alternative ODOT Ohio Department of Transportation pc passenger cars P(CMC) probability of a CMC PDO property damage only PennDOT Pennsylvania Department of Transportation PH Proportional Hazard (model) PO performance outcome PSEV probability of crash severity PSL posted speed limit PT percentage of trucks RDG Roadside Design Guide ROR run-off-road RR relative risk RSAP Roadside Safety Analysis Program RSAPv3 Roadside Safety Analysis Program, version 3 RSS redirection on the same side of the barrier SB southbound SBP slope breakpoint SCOD Subcommittee on Design SE standard error SUT Single Unit Truck SV single vehicle TCRS Technical Committee on Roadside Safety TDOT Tennessee Department of Transportation THR probability of passing through a feature; also used to designate crashes that penetrate, rollover, or vault the feature THRBAR probability of passing through, under, or over a barrier THREOL probability of passing across the opposing lanes TL test level TRB Transportation Research Board TT tractor trailer TTI Texas Transportation Institute VSL value of statistical life veh/day, vpd vehicles per day (vpd in Table 16) WRSF Brifen’s wire rope safety fence WSDOT Washington State DOT

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The variety of median widths and terrains combined with evolving testing specifications and lack of conclusive data on median crossover crashes have been obstacles to developing median barrier guidance.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 996: Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers develops, in a format suitable for consideration and possible adoption by AASHTO, proposed guidelines for the selection and placement of Manual for Assessing Safety Hardware (MASH) Test Levels 2 through 5 (TL2-TL5) median barriers.

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