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U.S. Department of Transportation
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Mayday Relay (MAYDAY)
§Sends a crash notification message a roadside DSRC hot spot, likely relayed via a properly-equipped passing  vehicle
§This information is then forwarded to the appropriate PSAP based on the crash location.
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Source: Greg Carter Herald Sun
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And the third application in the R.E.S.C.U.M.E. application bundle is Mayday Relay.

Essentially this system will help to transmit a range of data to roadside hot spot that can help to enhance incident response.  Some of the data elements that have been discussed are:

•Those generated though in-vehicle systems that can assist responders.  Examples of this type of data include vehicle location, number of passengers, seat belt usage, airbag status, point of impact, risks inherent with the type of vehicle (alternate fuel), air-bag deployment, delta velocity of vehicle involved in crash, likelihood of injury, vehicles final resting position (e.g., overturned), exact vehicle location (immediately adjacent to waterway) and infrastructure damage (e.g., bridge support);
•Relevant medical information and patient history used to expedite lifesaving care;
•Electronic manifest data collected from commercial vehicles that are involved in incident to identify load contents and to identify hazmat risks.