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A schematic is what describes the appearance of a diagram.  To represent a 'T' intersection, you select one of the 'T' schematics.  To represent an offset intersection, you choose an offset schematic.  If your data contains information about lanes, turn bays, distance from intersection, boulevards, mid-block crashes, etc. there is probably a schematic to represent your data.


Schematics are selected on the settings tab of the diagram panel.  A schematic contains the graphic representation of the curb lines and other physical attributes of the intersection.  More importantly, it also contains the description of a number of 'areas' where crashes can be located.  Each of these areas includes a condition, much like a filter, which describes which crashes can be located there.  Thus, a schematic can be created to suit almost any location you can describe.  This also allows you to make use of fields in your database that is unique to your data.


This chapter describes the available schematics, when they work, what they show, how to select them, and then how to modify or even create new schematics.