MC07-Roadway Maintenance and Construction (Service Package*)

The following discusses how the National ITS Architecture provides the transportation service described by this service package. Each numbered item describes the operation of that portion of the service package identified with the corresponding number on the transaction set diagram.

1. In order to support its operational activities, the Maintenance and Construction Management Subsystem (MCMS) inputs information regarding weather and the state of the road network. The information comes from the Surface Transportation Weather Service via the request/ response pair of architecture flows (transportation weather information request) and (transportation weather information), and from the Weather Service (weather information).
   
   
2. In order to maintain secure ITS infrastructure, it is imperative that security field equipment (e.g., surveillance equipment and other sensors) be in operational condition. To support this normal working status, periodically and on an exception basis, the Emergency Management Subsystem (EM) sends (security field equipment status) to the MCMS so that inoperable security equipment can be restored to working order. Following the maintenance actions the security equipment maintenance status is sent from the MCMS back to EM.
   
   
3. Another key activity of the MCMS is the maintenance of ITS and non-ITS field equipment. Fault indications from field devices are monitored directly by the MCMS (field device status) from the Roadway Subsystem (RS), or the fault information (field equipment status) could be sent from the Traffic Management Subsystem (TMS) or from the Information Service Provider (ISP) that manages its own set of equipment. Following the maintenance actions the equipment maintenance status is sent from the MCMS to the TMS and ISP. A local interface is provided to Maintenance and Construction Field Personnel to make a field device status request for local monitoring and diagnostics (field device status presentation), supporting field maintenance, repair, and replacement of field devices.
   
   
4. The Maintenance and Construction Management Subsystem can request information on equipment or materials (storage facility request) from the Storage Facility, which responds regarding equipment availability or maintenance materials storage status. In this market package the status of available materials might include sand (for treatment of spills) or herbicide (for spraying of the vegetation along the roadside).
   
   
5. The administrative functions of the MCMS include exchanging information with the Asset Management entity and Maintenance and Construction Administrative Systems. Asset Management provides asset inventory information, which could include static information about the assets (e.g. location, installation information, and materials information) as well as information that has been collected about the assets (e.g. video logs and current maintenance status). Asset Management sends asset restrictions to the MCMS, which could include height, width, or weight restrictions to various assets. Maintenance and repair needs are also sent by Asset Management to the MCMS for scheduling of repairs. The MCMS provides back to Asset Management changes to the status of pavement, bridges, signs and other assets resulting from maintenance or construction activities (asset status update). Another administrative function the MCMS supports is to provide overall work performance information (maint and constr work performance) to the Maintenance and Construction Administrative Systems to support contract administration.
   
   
6. Based on inputs from the Maintenance and Construction Center Personnel (maint and constr center personnel inputs), the MCMS makes requests (maint and constr administrative request) for administrative information or services. An example of services requested might be the reordering of additional road treatment materials. The Maintenance and Construction Administrative Systems responds with the information or status requested (maint and constr administrative information). The information is then presented to the center personnel (maint and constr operations information presentation).
   
   
7. As part of its maintenance operations and to help track its maintenance vehicles, the MCMS will potentially use a map-based representation of the area that it is maintaining. An interface to a Map Update Provider is available to keep this map-based representation of the transportation network current. The MCMS requests a map update (map update request), and the Map Update Provider electronically provides the update (map updates).
   
   
8. The Maintenance and Construction Vehicle Subsystem (MCVS) has several ITS systems (such as environmental sensors and dynamic message signs) that can be controlled and monitored either remotely from the MCMS (maint and constr vehicle system control) or directly from on board the MCVS. The same control flow from the MCMS can also control non-ITS systems on board the actual vehicle (e.g. materials spreader). For the non-ITS systems, the control (maint and constr vehicle control) is passed to the Basic Maintenance and Construction Vehicle (i.e. the part of the actual vehicle that is not considered an ITS element). One of the key items of information the Basic Maintenance and Construction Vehicle provides back to the MCVS (maint and constr material information) is the remaining quantity and current application rate of materials on the vehicle. In addition the maintenance and construction vehicle tracks its own location (position fix) and advanced safety system features such as lane following (safety system status). All of the status and information regarding ITS and non-ITS systems on the vehicle is provided to the Maintenance and Construction Field Personnel (maint and constr vehicle condition presentation) and to the MCMS (maint and constr vehicle operational data).
   
   
9. One of the key fleet activities of the MCMS is to dispatch the fleet vehicles. This maint and constr dispatch information, which can include routing, is sent to the MCVS, and presented to the Maintenance and Construction Field Personnel (maint and constr field personnel information presentation). The field personnel can acknowledge the dispatch request and provide inputs on their dispatch status as well as operator status, crew status, vehicle status, and equipment status (maint and constr field personnel inputs). This information is forwarded to the MCMS (maint and constr dispatch status).