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[aprssig] Symbols for traffic alerts

John Gorkos jgorkos at gmail.com
Fri Nov 11 20:50:24 UTC 2011


Steve -
   Where do you get the data?  This is a FANTASTIC use of APRS, one I've 
wanted to implement in the ATL area, but I can't find a good source of data.

John Gorkos.

On 11/11/2011 03:14 PM, Steve wrote:
> Morten,
>
> Here are the symbols I use for objects in my area:
>
> "BUILDING FIRE" "/:"
> "DEBRIS/FLUIDS ON HIGHWAY" "/P"
> "DISABLED VEHICLE BLOCKING" "/P"
> "DISABLED VEHICLE" "/P"
> "ELECTROCUTION" "EJ"
> "HAZARDOUS ROAD CONDITIONS" "Hj"
> "PLANE CRASH" "A'"
> "ROAD OBSTRUCTION" "Oj"
> "S/B AT HELICOPTER LANDING" "/X"
> "TRAIN CRASH" "T'"
> "VEHICLE ACCIDENT FIRE POLICE" "F'"
> "VEHICLE ACCIDENT INJURIES" "I'"
> "VEHICLE ACCIDENT MOTORCYCLE" "M'"
> "VEHICLE ACCIDENT PEDESTRIAN STRUCK" "P'"
> "VEHICLE ACCIDENT RESCUE" "R'"
> "VEHICLE ACCIDENT STAND-BY" "S'"
> "VEHICLE ACCIDENT UNKNOWN INJURIES" "U'"
> "VEHICLE ACCIDENT" "\'"
> "VEHICLE FIRE" "/:"
> "WOODS/FIELD FIRE" "/:"
>
> any other EMS "/a"
> any other Fire "/f"
> any other Traffic "/P"
>
> The Objects have a object id in the format "EMS XXXX", "FIRE XXXX", or
> "TFX XXXXX"  where XXXX is the base36 encoded incident number. I
> uppercase and use the incident type and subtype as the object comment
> text. If the incident is along a major roadway  (state route, highway,
> turnpike) I add an abbreviated version of the road followed by either
> a single pipe | if the incident affects only one lane/direction,
> double pipe || otherwise denotes that both lanes/directions are
> affected.
>
> I have a self adjusting net cycle time which retransmits still active
> incidents about every 20 minutes. this self-adjusts if there are a lot
> of incidents like during a blizzard, but it stays mostly at 20 minutes
> the rest of the time.
>
> I send these objects out with a path including  RFONLY,NOGATE and tag
> them with the !x! no-archive flag because I reckon that if someone has
> an internet connection to receive APRS-IS then they also have an
> internet connection to traffic.com or any of the other sources for
> traffic/incident information, and they don't need to get this from the
> aprs-is backbone, unlike most stations on RF.
>
> When sending object kill messages I replace the last part of the
> object comment text with (CLEARED) so that text-only displays like the
> hamhud and D700 users can see that the incident has ended.
>
> I populate the Object's timestamp with the dispatch time of the
> incident, comparing it to when you received the object you can
> calculate how long the incident has been active.
>
> here's an example:
>
> AB3LT-1>APZS13,WIDE2-2,EPA2-2,RFONLY,NOGATE:;TFX
> 6USLF*021347z4001.50NI07513.70W'I76 || VEHICLE ACCIDENT INJURIES
>   !x!
>
> AB3LT-1>APZS13,WIDE2-2,EPA2-2,RFONLY,NOGATE:;TFX
> 6USLF_021347z4001.50NI07513.70W'I76 || VEHICLE ACCIDENT
> INJURIE(CLEARED)!x!
>
>
> hope this helps and 73,
> Steve AB3LT
>
> On Fri, Nov 11, 2011 at 3:43 AM, Morten Johansen<morten at bzzt.no>  wrote:
>> Hi, list!
>>
>> I've been following the list for a while, but this is my first post. I hope this is the right place to post this question.
>>
>> The Norwegian Road Authorities are kind enough to post traffic alerts in XML format including geographic position, urgency information and other "snacks".
>> For some months now I've run an experiment that analyzes these alerts for my area and injects them into the APRS-IS as objects.
>>
>> There has been lots of feedback, and all interested parties (including NRRL) have been rounded up in a mailing list to try to outline a permanent service.
>>
>> Alerts have a "type", of which the most common are: "closed road", "temporarily closed road" or "reduced navigability road". It basically describes the impact of the alert for traffic.
>>
>> The majority of the alerts come from road work, and because of this the \j Work Zone symbol is used by default.
>>
>> Our question to this list is what APRS symbols we should use for these situations:
>>
>> * Closed road
>> * Traffic incident - \' ? We have no way of knowing if it's a car, truck or whether there are several involved. Looking for a general traffic incident symbol.
>>
>> We also would like some opinions on which symbol should have precedent in case of "closed road" because of "traffic incident".
>>
>> Should the "closed road" symbol be used always for consistency?
>> Should the "traffic incident" symbol be used to provide information granularity?
>> The object text will contain a short description of the situation in any case.
>>
>> de Morten LA1FTA
>>
>>
>>
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