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?

Estimate how many approximate Guardian Shield ALPR locations a route may pass. The current city list contains 73 active location/direction entries; this tool groups them into 52 approximate geographic locations so multiple directional entries at one intersection are not automatically treated as separate physical cameras.

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.
Approximate ALPR location map0 of 52 grouped locations positioned
Likely encounters—route passes very near location
Possible encounters—within uncertainty buffer
Public entries represented—direction/location listings, not devices
Route distance—when available

Estimated encounters

Create a route to compare it with the published Guardian Shield locations.

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

The city publishes location/direction descriptions rather than exact camera coordinates. Behind the Shield MJ groups the 73 current entries into 52 approximate geographic locations. Named-road intersections are positioned from OpenStreetMap road geometry; place-based entries may use a cached geocoding result. Exact poles are not claimed.

  • Likely means the route comes within roughly 85 meters of an approximate listed location.
  • Possible means the route comes within roughly 170 meters, but not within the likely threshold. These are proximity bands chosen for this estimator to accommodate approximate map placement; they are not claimed camera detection ranges.
  • Each geographic location is counted once per route, even if the city lists multiple direction-specific entries there. The secondary “public entries represented” number shows how many published entries exist at those encountered locations.
  • The estimate does not know the exact camera field of view, lane coverage, uptime, whether a listed entry is one physical device, or whether an image was successfully captured.
  • Passing a listed location is therefore a capture opportunity estimate, not evidence that a particular vehicle or plate was recorded.
  • 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.