The Collision Diagram page allows users to display collision results in an interactive collision diagram. The collision diagram is only accessible after querying for an intersection history or after spatially selecting collisions from the map and opening in a new window. The collision diagram is similar to the map view, with an informational panel on the left and the main map component on the right side of the screen. A toolbar panel contains several options to modify the view and symbols.
Collision Diagram Information Panel
The Collision Diagram Information Panel is located on the left side of the window. This panel can be shown or hidden by clicking the Map Contents button. This panel contains a Legend, a Mapping Summary, and Collision Filtering.
The Legend is a key to all of the symbols used on the map. The symbols on the legend's left side represent a vehicle's movement (or non-movement). On the right are the symbols for pedestrians, bicycles, objects (trees, light poles, etc.), and crashes.
The mapping summary shows how many of the mapped collisions are fatal vs. injury. It also shows the total number of collisions that were mapped or not drawn. Collisions are not drawn when parties' movements are not valid (e.g. a collision between two parked cars). When there are more than two parties involved, only the first two parties assigned to the collision are used to draw the symbol.
Collision Type Filtering
Customize the type of collisions to be shown by checking/unchecking the collision types in the Collision Filtering menu. The collision counts are shown after each type.
The Map is the main pane of the Collision Diagram tool. This is where the collision symbols are displayed. The map can be maximized by hiding the Collision Diagram Information panel.
Besides panning and zooming the map, clicking on a collision will display a details pop-up. It is similar the map results view details, except it also includes party type and movements. Two other features include the ability to rotate or move the collision.
Clicking rotate will show a gray circle around the symbol. Click+dragging anywhere in the circle will allow you to rotate the symbol. This can be useful if you are zoomed in with background imagery and want to have the symbol aligned with the roadway before printing.
Clicking move will change the symbol gray and change the mouse hover symbol indicating the symbol can be moved. Then simply drag and drop the symbol where you would like to place it. This feature is beneficial if the precise location of the collision needs to be adjusted.
The map toolbar at the top of the window is used to customize the appearance of the map and the collision symbology. The Map Contents toggles the collision diagram panel on the left and the Basemap switches the background maps. Several features unique to the collision diagram are the ability to switch to a classic view, change the map opacity and modify the icon size.
The classic view checkbox allows you to switch from the map based view to a traditional standardized intersection view with symbols aligned according to the party movements. The collision symbols are displayed on a white background to give a clear, organized view of the symbols. The classic view is more appropriate when viewing an intersection history where many symbols will overlap.
The map opacity control bar allows the map background's transparency level to be adjusted. It is especially useful when the imagery basemap is active since symbols show up more clearly when the background is more transparent.
The icon size control bar allows you to change the size of all the symbols displayed on the map.