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Page 62 <br /> <br /> <br />Attachment “B” (page 1 of 2) <br />Collision Pattern Analysis Procedure <br />Last update: Mark Candland 01/11/2023 <br />The process for searching for patterns in collision data is described in detail below. The first step is to <br />identify locations with multiple collisions over the desired time frames. These locations are either at an <br />intersection or along a roadway segment. This is accomplished with reports generated from our collision analysis software <br />(Crossroads Analytics). Reports are currently based on frequency of collisions, not rates. The second step is a detailed <br />analysis of the specifics of each collision. <br /> <br />Locations: <br />Reports created through Crossroads Analytics: <br />o The following intersection and midblock reports are created: <br /> All Vehicle High Incident Intersection (current year) <br /> All Vehicle High Incident Intersection (three-year) <br /> Bicycle High Incident Intersection (three-year) <br /> Pedestrian High Incident Intersection (three-year) <br /> All Vehicle High Incident Midblock (current year and three-year) <br /> Bicycle High Incident Midblock (three-year) <br /> Pedestrian High Incident Midblock (three-year) <br />Analysis: <br />The intersection and midblock reports are analyzed for patterns. Initial review looks for patterns in the <br />summary reports created in Crossroads Analytics. Some will only be able to be identified when reviewing the <br />detailed collision reports. Patterns in the following attributes are reviewed: <br />o Direction of travel <br />o Collision type <br />o Time of day <br />o Day of week <br />o Time of year <br />o School or peak travel time <br />o Movement preceding collision <br />o Vehicle at fault <br />o Primary collision factor <br />o Object type hit <br />o Location of collisions <br /> Look at what happens at that location (driveway/lane merge/congestion) <br /> Also consider land use/landscaping/sight distance <br />o Vehicle involved with bicycle/pedestrian <br />o Sobriety/Fatigue <br />o Weather <br />o Sun position <br />o Traffic control device visibility <br />o Driver speeds <br />o Unusual roadway conditions (construction/recent change/event) <br />o Witness and party statements as to why collision occurred <br /> Many times the driver at fault is not paying attention (for various reasons)