Behind the Shield MJ logo
INDEPENDENT CIVIC TRANSPARENCY • MOUNT JULIET, TENNESSEE

Behind the Shield MJ

Guardian Shield Transparency Project
ROUTE EXPOSURE ESTIMATOR

How visible is your drive?

Compare a route with estimated ALPR reference locations derived from the City of Mt. Juliet’s published Guardian Shield “Active ALPR Locations” list. The city currently publishes 73 location/direction entries; Behind the Shield MJ groups those descriptions into 52 approximate map points for this estimator.

Estimated locations onlyThese dots are approximate reference points, not exact camera coordinates. A single dot does not necessarily represent one physical camera; it may group more than one city-listed direction and/or more than one camera at the same general location. This tool estimates route proximity only. Passing near a dot does not prove that a camera was aimed at your lane, operating, read your plate, or captured an image of your vehicle.
Privacy choiceQuick mode sends the start/destination search to a geocoder and route coordinates to a routing service. Choose on map skips address search; by default its clicked points are sent to the routing service so the line follows the fastest driving route. You can turn road snapping off to keep the clicked route points local as straight lines. Both modes load OpenStreetMap map tiles and the Leaflet map library from a public CDN.
Estimated ALPR reference map52 approximate points
Very near mapped points—within ~85 m of estimated point
Within wider buffer—~85–170 m from estimated point
Public entries represented—entries, not a physical-camera count
Route distance—when available

Mapped ALPR references near this route

Create a route to compare it with the estimated map points derived from the City’s published Guardian Shield locations.

No route yet.
How the estimate works — and what it cannot tell you

Source and scope: the reference points are derived from the City of Mt. Juliet’s published Guardian Shield “Active ALPR Locations” list. The City publishes general location/direction descriptions rather than exact pole coordinates. Behind the Shield MJ manually places those descriptions at approximate geographic reference points for route estimation. A dot is therefore not a device inventory: one dot may represent one city-listed entry, several direction-specific entries, one camera, or multiple cameras in the same general area.

  • Very near means the route comes within roughly 85 meters of an estimated mapped reference point. This is a proximity measurement, not a prediction that a camera captured the vehicle.
  • Wider buffer means the route comes within roughly 170 meters, but not within the 85-meter band. These are map-uncertainty buffers chosen for this estimator; they are not claimed camera detection ranges.
  • Each approximate map point is counted once per route. Because several city-listed directions can be grouped at the same general location, one dot does not equal one camera. The “public entries represented” number counts city-published entries represented by nearby dots; it is not a physical-camera count.
  • The estimator does not establish exact camera coordinates, field of view, lane coverage, the number of physical devices at a point, uptime, or whether any image was successfully captured.
  • Passing near a mapped point therefore means only that the route passed near an estimated reference location derived from the City’s list. It is not evidence that a camera saw the vehicle, read the plate, or captured an image.
  • Quick search is biased toward Middle Tennessee but is not restricted to Mount Juliet. In choose-on-map mode, road snapping uses the fastest driving route returned through the selected points; extra map clicks act as via points.

The estimator is designed to make the scale of the public location list understandable, not to provide a real-time map of police activity.