Link Type: Vehicle On-Board

Transit Vehicle Databus --> Transit Vehicle OBE:
host transit vehicle status


host transit vehicle status (Information Flow): Information provided to the Connected Vehicle on-board equipment from other systems on the Transit Vehicle Platform.

Transit Vehicle Databus (Source Physical Object): The 'Transit Vehicle Databus' represents the vehicle databus that interfaces with on-board equipment on a transit vehicle. It is a specialized and extended form of the Vehicle Databus that is subject to different vehicle databus standards and hosts a broad range of components that are unique to a transit vehicle including the farebox and associated electronics, passenger counters, and transit security systems. As a specialized form of the Vehicle Databus, it also provides access to the general-purpose sensors (e.g., radars, cameras), GPS, drive train monitoring and control systems, and vehicle safety features that support connected vehicle applications. The Transit Vehicle may represent a bus, paratransit vehicle, light rail vehicle, or other vehicle designed to carry passengers. In CVRIA, the 'Transit Vehicle Databus' is used to represent the onboard interactions between the Transit Vehicle OBE and the other systems included in a host transit vehicle.

Transit Vehicle OBE (Destination Physical Object): The Transit Vehicle On-Board equipment (OBE) resides in a transit vehicle and provides the sensory, processing, storage, and communications functions necessary to support safe and efficient movement of passengers. The types of transit vehicles containing this physical object include buses, paratransit vehicles, light rail vehicles, other vehicles designed to carry passengers, and supervisory vehicles. It collects ridership levels and supports electronic fare collection. It supports a traffic signal prioritization function that communicates with the roadside physical object to improve on-schedule performance. Automated vehicle location enhances the information available to the transit operator enabling more efficient operations. On-board sensors support transit vehicle maintenance. The physical object supports on-board security and safety monitoring. This monitoring includes transit user or vehicle operator activated alarms (silent or audible), as well as surveillance and sensor equipment. The surveillance equipment includes video (e.g. CCTV cameras), audio systems and/or event recorder systems. It also furnishes travelers with real-time travel information, continuously updated schedules, transfer options, routes, and fares. In CVRIA, a separate 'Vehicle OBE' physical object supports the general V2V and V2I safety applications and other applications that apply to all vehicles, including transit vehicles. The Transit Vehicle OBE supplements these general capabilities with capabilities that are specific to transit vehicles.

Communication Diagrams

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This partial profile, showing only physical objects and flow, describes communications between equipment that reside on the vehicle. The CVRIA does not contain any specific information on standards for on-board vehicle communications.



None defined


This information flow triple is in the following applications with the following security levels.

Information Flow Security
Application Confidentiality Integrity Availability
Basis Basis Basis
Transit Signal Priority Moderate Moderate Moderate
This can include some sensitive data. However, other data, such as vehicle location and motion will then be broadcast. There also may be proprietary information included in this. This is used later on to determine whether a vehicle should request priority at an intersection. If this information is incorrect the vehicle may make false requests. All other flows that use the data from this flow have a MEDIUM integrity requirement, therefore, this must also have a MEDIUM integrity requirement. This information would need to be available immediately for the application to work.