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... NCHRP 17-59 1 SUMMARY Most multiple vehicle crashes at three- and four-leg intersections with stop control on the minor road can be classified as either gap acceptance crashes or traffic control device violations (e.g., stop sign violations) , with gap acceptance crashes generally occurring more frequently.
From page 2...
... NCHRP 17-59 2 collected using Geographic Information Systems (GIS) databases, Highway Safety Information System (HSIS)
From page 3...
... NCHRP 17-59 3 The charts are included in a stand-alone guidance document. The guidance document also includes a summary of key background information on ISD and step-by-step instructions on how and when to use the ISD CMFunction charts.

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