Simply put, it monitors gps data from mobile's beacons from various locations as they pass through these locations. For example, K3QQN-9 beacons his position as he passes westbound through a stretch of I-264 near Brambleton Avenue in Norfolk. He travelling at 58 miles per hour. My station takes his direction of travel and speed and sends a "milepost" object with his information. The text frame would look like this on a home computer:
264W_X11 West Speed 58Mph Time 1800 I-264 west @ Brambleton Ave.
The translation for the above is this:
264W_X11 is the object created for this location. Interstate 264 west near exit 11.
West is the direction of travel.
Time 1800 is self explanatory.
I-264 @ Brambleton Ave is the text description of the object location.
Since I do not have a Kenwood D-700 or D7A, I do not know exactly what it looks like on those screens. If anyone can save a screen and send a pic to me via e-mail it would be appreciated.
Note that there is a one mile stretch of highway beyond a designated point
where a mobile can trip the signpost. In the example above, K3QQN-9 can trigger the I-264 west @ Brambleton Avenue signpost anywhere on I-264 between Brambleon Avenue and the Berkley Bridge. Note also that this signpost is set so that only mobiles on I-264 westbound will trigger the signpost. Signpost can be set to trigger at any direction or a specific direction(s). A signpost can be set at a location BEFORE a known highway choke point to monitor speed appraching said choke point. A local example would be before a tunnel. I have signposts set to trigger only when a mobile beacons in the direction of a tunnel. Case in point if a mobile beacons on I-64 westbound in Norfolk @ 4th View St., 3 miles before the Hampton Roads
Bridge-Tunnel, UI-Signpost will send the object and text. However, another mobile beaconing eastbound leaving the tunnel on that same stretch will not trigger the signpost.
Below is a list of locations I've selected to monitor traffic:
|Object Name||Object Location||Details|
|264E_X6||I-264 east @ Des Moines Ave.||Portsmouth approach to Downtown Tunnel|
|264W_X11||I-264 @ Brambleton Ave.||Norfolk approach to Downtown Tunnel|
|264E_X13||I-264 east @ Military Hwy|
|264W_X15||I-264 west before Newtown Rd.|
|564W||I-564 west @ Terminal Blvd||Toward Naval Station Norfolk|
|64E_X261||I-64 @ Hampton Roads Center Pkwy.|
|64E_X263||I-64 @ Mercury Blvd.||Coliseum Central area|
|64W_X263||I-64 @ Mercury Blvd.||Coliseum Central area|
|64W_X265||I-64 @ La Salle Ave.|
|64E_X267||I-64 east @ Settlers Landing Rd.||Hampton approach to Hampton Roads Bridge-Tunnel|
|64W_X270||I-64 west @ 15th View St.||Norfolk approach to Hampton Roads Bridge-Tunnel|
|64W_X273||I-64 west @ 4th View St.||HRBT traffic often backs up beyond here.|
|64W_X277||I-64 west @ Tidewater Dr.||1 mile before I-564 split to Naval Base|
|64E_X284||I-64 east @ Lake Taylor||1 mile before the named exit with I-264, known as "the interchange".
Compass direction is south but is still east bound.
|64W_X284||I-64 west @ Twin Bridges||1 mile before named exit with I-264, known as "the interchange".
Compass direction is north but is still west bound.
|64E_X286||I-64 east before Indian River Rd.||Compass direction is south but is still east bound.|
|64W_X286||I-64 west before Indian River Rd.||Compass direction is north but is still west bound.|
|64E_X289||I-64 east @ Greenbrier Pkwy.||Compass direction is west but is still east bound.|
|64W_X289||I-64 west @ Greenbrier Pkwy.||Compass direction is east but is still west bound.|
|64E_X290||I-64 east @ Battlefield Blvd.||Compass direction is west but is still east bound.|
|64W_X290||I-64 west @ Battlefield Blvd||Compass direction is east but is still west bound.|
|64E_HRB||I-64 east @ High Rise Bridge.||Compass direction is west but is still east bound.|
|64W_HRB||I-64 west @ High Rise Bridge.||Compass direction is east but is still west bound.|
|464N_X5||I-464 north @ South Main St.||Chesapeake approach to Downtown Tunnel/Berkley Bridge|
|664N_X2||I-664 north @ Powhatan Pkwy||1 mile before I-64 in Hampton|
|664S_X6||I-664 south @ 26th St.||Last exit before Monitor-Merrimack Memorial Bridge-Tunnel in Newport News|
|664N_X8||I-664 north @ College Dr.||Last exit before Monitor-Merrimack Memorial Bridge-Tunnel in Suffolk|
|664S_X12||I-664 @ Dock Landing Rd.|
|PINNERS||Portsmouth approach to Midtown Tunnel|
|W_GHENT||Hampton Blvd @ W 21st St||in the West Ghent section of Norfolk, only southbound traffic on Hampton Blvd. south of W 21st St will trigger this signpost.|
WB4APR has been running his own traffic monitoring program, APRStfc (APRSdos) from the U.S. Naval Academy (W3ADO-14) station in Annapolis. His system monitors the Annapolis/DC/Baltimore metro area. See his page, "APRS Traffic Speed Monitoring" on his system and how he'd like to link up with the Maryland traffic monitoring system.