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- W2182081172 abstract "1 The annual cost of congestion in the United States reportedly exceeds $120 billion (1). 2 Freeway incidents are major sources of non-recurrent congestion and the resulting secondary 3 crashes can prolong the traffic impact and increase the cost. Research on secondary crashes to 4 support statewide transportation system management has been limited. In the current study, a 5 two-phase automated procedure is developed to identify secondary crashes on large scale 6 regional transportation systems. In the first phase, a crash pairing algorithm is developed to 7 extract spatially and temporally near-by crash pairs. The accuracy and efficiency of the algorithm 8 were validated by comparing to an ArcGIS based program. In the second phase, two filters are 9 proposed to reduce the crash pairs for secondary crash identification: the first filter selects crash 10 pairs whose earlier crashes were on mainline highways; the second filter selects crash pairs 11 whose later crashes happened within the dynamic impact areas (i.e., backup queues) of the 12 earlier crashes. Shockwave theory is used to model the dynamic impact of a primary incident. 13 The two-phase procedure uses a linear referencing system for crash localization and can be 14 applied to any regional transportation system with a similar data structure. A case study was 15 conducted on nearly 1,500 miles of freeways in Wisconsin using 2010 data. Among the crash 16 pairs produced by the two-phase procedure, 79 secondary crashes were confirmed via police 17 reports. Preliminary analyses showed that 1) secondary crashes occurred in the same traffic 18 direction as the primary incidents were about three times greater in frequency compared to 19 secondary crashes in the opposing direction, and 2) two-vehicle rear-ends, multiple-vehicle rear20 ends, and sideswipes were three major types of secondary crashes (over 85%). 21 TRB 2014 Annual Meeting Paper revised from original submittal. Zheng, Chitturi, Bill, and Noyce 2" @default.
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- W2182081172 date "2014-01-01" @default.
- W2182081172 modified "2023-09-27" @default.
- W2182081172 title "Secondary Crash Identification on A Large-scale Highway System" @default.
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