ArcMap is aware when data has been added to a map. When route data is added, ArcMap exposes some additional properties for the new layer. One of these new properties is the route identifier field.
The route identifier uniquely identifies each route within a feature class. The route identifier field can be any numeric or character field in your route feature class.
Setting the route identifier field saves steps when using many of the linear referencing and dynamic segmentation dialog boxes and wizards in ArcMap.
- Right-click the route layer in the table of contents and click Properties.
- Click the Routes tab.
- Click the Route Identifier drop-down arrow and click the field that is to be used as the route identifier.
- Click OK.