United States · Census TIGER · DeFlock / OpenStreetMap
America’s invisible fence is taking shape
Red and violet are the story. They mark communities where every major way in and out is
covered. The camera points underneath show the infrastructure creating that fence. Green rings
on a state line are ways out that no mapped camera watches.
Open the DeFlock source map ↗
What “all major entrances and exits covered” means
Major entrance = a numbered route crossing the boundary — Interstate, US, State or County
highway — taken from Census TIGER/Line road centrelines, which label route type directly. Residential
streets, township roads and farm lanes are excluded.
Covered = a mapped ALPR within 400 m (0.25 mi) of the crossing, or within 30 m of that same
route anywhere inside the boundary. Either way you cannot drive that corridor in or out without being read.
One entrance = one route arriving from one direction. A ragged municipal line can cut the same highway
four or five times inside a mile; a driver still only enters once, so those collapse. A route that genuinely
arrives from two different sides of town counts twice.
Corridor sealed = two or more major entrances, every one covered,
and the place is not otherwise fully enclosed. You can still leave. You cannot leave on a highway.
Can you leave the state without being logged?
Every numbered route that crosses a state line is scored against the national camera index on both sides.
Green — no mapped ALPR within 400 m either side.
Red — the state you are leaving reads you.
Amber — your state does not watch it, the next one reads you arriving.
Leaving unwatched is not the same as arriving unwatched.
Green means no camera is mapped there. DeFlock is crowd-sourced, so it is evidence of an absence in the
data, not proof of an absence on the road.