The Collision Diagrams application allows users to generate collision diagrams for intersections utilizing the available crash and vehicle data for their agency. Users can use the Collision Diagrams application to view trends and problem areas for an intersection, details of each crash, review the crash narrative and even edit the crash data to more accurately reflect the crash narrative. Collision Diagrams is broken into two main sections: the Collision Diagram, and the Collision Explorer. Additionally, users can download a Collision Diagram Report. Each of these sections will be discussed in more detail below.
The collision diagram section displays all collisions for the selected intersection superimposed on a simplified intersection diagram. Each collision is grouped into a Collision Cluster indicating the estimated crash location, travel direction, and manner of collision. Each Collision Cluster contains an icon indicating the manner of collision, the number of collisions, as well as a color-coding indicating the severity distribution of the crashes.
(A collision Diagram of a given intersection, with various Collision Clusters, indicating the estimated location, direction of travel, manner of collision, and number and severity of crashes.)
Clicking on a Collision Cluster will open the Collision Explorer sidebar. The sidebar contains a high-level overview of the crashes that make up the selected Collision Cluster, including Year, Weather Conditions, Light Conditions, and other data points associated with the crashes.
(The Collision Explorer sidebar displaying the overview statistics for a selected Collision Cluster.)
Users can also view crash-level data under the Details tab of the Collision Explorer sidebar. From here users can review details regarding each crash in the selected Collision Cluster, including crash and vehicle data, as well as the crash narrative. Users can even elect to exclude the crash from the diagram.
(The Crashes tab of the Collision Explorer sidebar.)
Users may also edit various fields in the Details tab of the Collision Explorer sidebar. (Note: depending on the permissions of the user, the edits may only be applied to the saved query, and not be reflected throughout the rest of the Numetric applications. Users with the Edit Crash Data User Role will be able to do a non-destructive edit of the crash data, which will be displayed through the rest of the Numetric applications. More information about data editing can be found in the Editing Crash Data article.) The following fields are editable in the Collision Diagrams application:
Manner of Collision
First Harmful Event
(The Narrative and Attributes section of Collision Diagrams. Note the crash narrative on the left side of the screen, the editable fields located in the center, and the edit and comment history on the right.)
Collision Diagram Report
With an intersection selected, users can save a Collision Diagram Report, as a downloadable PDF containing the Collision Diagram representation, a satellite image of the intersection, Google Streetview thumbnail of the intersection, as well as various crash counts, and crash metrics related to the selected intersection.
(A preview of the Collision Diagram Intersection Report.)