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[aprssig] Symbols for traffic alerts

Steve AB3LT at RoseAndSteve.us
Fri Nov 11 22:25:50 UTC 2011


Likewise over our way.

On Fri, Nov 11, 2011 at 5:10 PM, Shawn Stoddard <stoddard at pobox.com> wrote:
> At least in tennesse there is a RSS feed for some of the wrecks and
> construction.
>
> --
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
>
> John Gorkos <jgorkos at gmail.com> wrote:
>>
>> 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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>> >>
>> >
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