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Here is an example of an actual, operational system being built.
The idea is to get important information to travelers where and when they need it, on a situational basis.
Multiple indicator data help predict dangerous situations, like possible bridge icing.  System pushes warning out to vehicles in the vicinity
Earlier pilot deployments were highly manual . . .
Next generation:
The important information can be delivered to an appropriately located data warehouse, which push it to vehicles via DSRC, or via an Internet pull request from the vehicle (which makes the request as it approaches warehouse, since the vehicle always knows where it is).  Other broadcast mechanisms include satellite.
There is a chain of events to get situational data to the right vehicles
Back office program creates data unit.
Data unit gets moved into data warehouse
Warehouse can “sprinkle” data onto passing vehicles, or the passing vehicles can pull it in, perhaps as part of a data bundle.
Tool allows people to generate examples of traveler situation data elements, and launching them toward specific sets of vehicles.  Includes message content,channel, timeframe, etc.
[demonstrates tool . . . “Caution: Zombies Ahead!”]
[demonstrates spreadsheet with the detail behind the tool]