The Grid Index Features tool creates a polygon feature class or shapefile in a regular grid that can be used as an index to specify pages for a map series. You also have the option of creating a grid that only includes polygon features that intersect with another feature layer or layers. So, if you are creating a new grid index for your bus routes, the tool can be set to ignore any areas within your map that do not contain a bus route.
The following screenshot shows how there are several parameters that you can specify for this tool:
As you can see in the preceding screenshot, Output Feature Class is a mandatory parameter because the purpose of this tool is to create a new feature class that will serve as the index for a map series. If you only want index polygons created for areas where specific layers exist, then you will need to add those limiting layers to Input Features.
The parameters...