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- W626493902 abstract "This paper proposes a crash frequency modeling typology for interstate freeways. Using a nine-year continuous panel of crash histories of total crash frequencies on interstates in Washington State for the period (1999-2007), random parameter negative binomial (RPNB) models are estimated for a variety of crash related outcomes. A total of 21 different outcomes were assessed in terms of four typologies: a) severity, b) number of vehicles involved, c) crash type, and d) crashes by interchange type. The sub-models within these major categories included: RPNB specifications for all severities (property damage only, possible injury only, evident injury, disabling injury and fatality), number of vehicles involved (one-vehicle to five-or-more-vehicle), crash type (sideswipe, same direction, overturn, head-on, fixed object, rear-end and other), and location types (urban interchange, rural interchange, urban non-interchange, rural non-interchange). A total of 1,153 directional segments comprising of the seven Washington State interstates were analyzed, yielding a statistical model of crash frequency based on 10,377 observations. It was found that several geometric effects were random in their interaction with the logarithm of average daily traffic, meaning the interaction varied from segment to segment. These results suggest that segment specific insights into crash frequency occurrence can be improved for appropriate design policy and prioritization insights via more accurate characterization with interactions. This suggests that flow interactions are critical even after flow is accounted for as a main effect. The conventional approach has been to include flow as a main effect either in logarithmic form or in linear form." @default.
- W626493902 created "2016-06-24" @default.
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- W626493902 date "2013-01-01" @default.
- W626493902 modified "2023-09-25" @default.
- W626493902 title "Some Insights into Roadway Geometric Effects on Interstate Crash Occurrence from a Crash Typology Perspective" @default.
- W626493902 hasPublicationYear "2013" @default.
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