r stop signs, or they may be barriers delimiting the navigable network such as curbs and guardrails. Assets may also include polygonal features that must be maintained, such as medians or parking lots. There are two main groupings of Assets, one set is made up of objects, and the other set is made up of features. The objects are point and line representations that will be displayed using linear referencing.
The Activities Package of the ArcGIS?Transportation Data Model is similar in many respects to the Assets Package. Both are comprised of objects that are related to the underlying network, but are not elements of the network itself. Both Assets and Activities can represent features with a variety of spatial representations. However, Activities differ from Assets in that Assets generally represent physical objects at a point or along a section of the network, while Activities represent similarly referenced transient occurrences. Additionally, Activities are transient objects that represent planned actions rather than unexpected occurrences such as traffic accidents. Activities are transient objects referenced to the transportation network.
Occurrences such as traffic accidents, citations, or spills are examples of objects that in the ArcGIS?Transportation Data Model are termed Incidents. Incidents are very similar to both Assets and Activities in that they are referenced to the network and can have multiple spatial representations. Incidents vary from Activities only in the nature of the occurrence.
Mobile Objects are representations of the entities that are transported across a transportation network. Whether it is a pedestrian walking along a road, or a car traveling down a highway, a primary focus of transportation management is the act of efficiently moving goods and people. Mobile Objects are those things
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