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U.S. Department of Transportation
Triscallion_Black
State DOT/Local DOT
Existing Capabilities
New Capabilities
Limited traffic data from point detectors (eg., inductive loops) and CCTV surveillance augmented by localized use of probe vehicles.
Rich traffic data set from continuous output of substantial fraction of vehicles throughout entire road network in addition to the fixed sensors. 
Communication with customers via Changeable Message Signs, radio beacons, and traffic messages in the media.
Core System technology allows direct, targeted communication with vehicles regarding incident warnings, travel time, weather warnings, etc., in real-time.
Incident detection via Traffic Management Center controlled cameras, law enforcement input or phone calls by the traveling public.
Incident detection can be accomplished in real-time. Severity of incidents (accident or stranded vehicle?) determined almost instantaneously and appropriate resources dispatched.
Congestion management through static devices such as ramp meters with predetermined schedules and fixed speed limits.
More flexible tools such as variable speed limits and dynamic traffic signal operations triggered by actual and predicted traffic.
Use Case Requirements
Yes
Trusted Communications
Yes
Privacy
Yes
Data Publish-Subscribe
Yes
Data Geocast
V2V&I
Type of Communications
Value/Why Would Stakeholder Shift to Using a Core?
Core System’s V2I applications dramatically enlarge the communication capabilities of Traffic Management entities. This new capability will allow DOTs to deal with traffic management on a far more detailed, microscopic level than currently possible.
More accurate measurement and prediction of the traffic state across a wide network enabled by the new and richer data sets will allow much better traffic control and traffic flow.

Alternatives to Using a Core System
Fixed point detectors like inductive loops, radar and video sensors.
CCTV surveillance also informs operators of traffic conditions at fixed locations.
Probe vehicles and cellphone tracking are used in a very limited fashion by commercial data providers and local DOTs.
The secure communications enabled by the Core System for the connected vehicle environment increases the scale of available traffic data by orders of magnitude, even if only a fraction of vehicles are connected.  Achieving coverage on this scale by existing detector technology is not financially feasible.

Currently Traffic Management entities use fixed or mobile Changeable Message Signs (CMS) to communicate in real-time with the travelers on the road.  Highway Advisory Radio (HAR) is also used in a number of areas but with a small footprint.  Other communications are fixed signage and information supplied to pretrip sources like kiosk or internet.  The effectiveness of messages depends on the location of the CMS or HAR relative to the incident.  Connected vehicle applications can communicate directly to the driver with more effective in-vehicle messaging that may even be unique to that driver’s vehicle.  The kind of information available now online and via social media can be pushed to the vehicle.  Furthermore, this communication covers a much larger area than possible with fixed signage.