diff --git a/scripts/qa-cables-overlay.mjs b/scripts/qa-cables-overlay.mjs
index 59a65c6b1..c1e4cbfe9 100644
--- a/scripts/qa-cables-overlay.mjs
+++ b/scripts/qa-cables-overlay.mjs
@@ -2,6 +2,7 @@
 // Cesium-only probes: native DataSource counts and scene-render timing measure the Cesium cable adapter.
 import { evaluateWithGeo } from './qa/geometry.mjs';
 import { whenSettled } from './qa/ready.mjs';
+import { measureIdleRender } from './qa/idle.mjs';
 import { launchBrowser, closeBrowser } from './qa/browser.mjs';
 /**
  * qa-cables-overlay — submarine-cable label path measurement + contract gate.
@@ -184,12 +185,8 @@ try {
     : 'scene.render cost, cables ON, 10s orbit', frameCost);
 
   // ── d. parked idle honesty (labels must not force continuous render) ──
-  await whenSettled(page); // orbit stop + fades settle
-  const idle = await page.evaluate(() => new Promise((resolve) => {
-    let renders = 0;
-    const remove = window.__godsEyeView.engine.frames.postRender.addEventListener(() => { renders += 1; });
-    setTimeout(() => { remove(); resolve({ renders }); }, 5_000);
-  }));
+  await whenSettled(page);
+  const idle = await measureIdleRender(page);
   report(control
     ? 'parked idle, control (postRender fires / 5s)'
     : 'parked idle with cables ON (postRender fires / 5s)', idle);
diff --git a/scripts/qa-directions.mjs b/scripts/qa-directions.mjs
index 17e3db98d..d593c6a05 100644
--- a/scripts/qa-directions.mjs
+++ b/scripts/qa-directions.mjs
@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 // Cesium-only probes: native primitive inspection independently verifies the Cesium route geometry.
 import { evaluateWithGeo } from './qa/geometry.mjs';
-import { whenSettled, whenUiSettled, whenTilesLoaded } from './qa/ready.mjs';
+import { whenSettled, whenUiSettled, pollPage } from './qa/ready.mjs';
 /**
  * Browser proof of the Directions layer: real chip clicks, real globe clicks,
  * a real route from the real proxy, a real camera flight.
@@ -779,7 +779,14 @@ try {
     if (placed) {
       await waitForRoute();
       // Let the shared ground-floor cells warm and the dots re-anchor.
-      await whenTilesLoaded(page);
+      await pollPage(
+        page,
+        () => {
+          const { stepCount, stepsShown } = window.__gevQaDirections.drawn();
+          return stepCount > 0 && stepsShown.length === stepCount;
+        },
+        { timeoutMs: 60_000 },
+      );
       const denver = await evaluateWithGeo(page, async (qaGeo) => {
         const Cartographic = qaGeo.cartographic;
         const { stepCount, stepsShown } = window.__gevQaDirections.drawn();
diff --git a/scripts/qa-final-polish-credits.mjs b/scripts/qa-final-polish-credits.mjs
index 3e0e2aab5..eeeba0ad1 100644
--- a/scripts/qa-final-polish-credits.mjs
+++ b/scripts/qa-final-polish-credits.mjs
@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 /** Persistent inline attribution through actual OSM layer display lifetimes. */
-import { whenSettled } from './qa/ready.mjs';
+import { whenSettled, whenUiSettled } from './qa/ready.mjs';
 import { launchBrowser, closeBrowser } from './qa/browser.mjs';
 import assert from 'node:assert/strict';
 import fs from 'node:fs/promises';
@@ -53,6 +53,7 @@ try {
     );
   const shot = async (name, osm, tiles) => {
     await whenSettled(page);
+    await whenUiSettled(page);
     const state = await page.$eval('#cesium-credits', (e) => {
       const nodes = [
         ...e.querySelectorAll('a,img,.cesium-credit-expand-link'),
diff --git a/scripts/qa-infra-lod.mjs b/scripts/qa-infra-lod.mjs
index 808069e28..8b9895940 100644
--- a/scripts/qa-infra-lod.mjs
+++ b/scripts/qa-infra-lod.mjs
@@ -27,6 +27,7 @@ import { evaluateWithGeo } from './qa/geometry.mjs';
  * FAIL. Commits nothing.
  */
 import { whenSettled } from './qa/ready.mjs';
+import { measureIdleRender } from './qa/idle.mjs';
 import { launchBrowser, closeBrowser } from './qa/browser.mjs';
 import fs from 'node:fs';
 import path from 'node:path';
@@ -297,27 +298,7 @@ try {
 
   // ── parked-idle honesty: the LOD walk must not force continuous render ─
   await whenSettled(page);
-  const idle = await page.evaluate(async () => {
-    // The debug handle's own governor read (no /src import: runs on a build).
-    const { getRenderGovernorDiagnostics } = window.__godsEyeView;
-    return new Promise((resolve) => {
-      const startedAt = Date.now();
-      const tilesLoadedBefore = window.__godsEyeView.engine.surface.tilesLoaded();
-      let renders = 0;
-      let framesWithPendingTiles = 0;
-      const remove = window.__godsEyeView.engine.frames.postRender.addEventListener(() => {
-        renders += 1;
-        if (!window.__godsEyeView.engine.surface.tilesLoaded()) framesWithPendingTiles += 1;
-      });
-      setTimeout(() => {
-        remove();
-        const governor = getRenderGovernorDiagnostics();
-        resolve({ renders, tilesLoadedBefore, tilesLoadedAfter: window.__godsEyeView.engine.surface.tilesLoaded(),
-          framesWithPendingTiles, mode: governor.mode, holds: governor.holds,
-          requests: governor.recentRequests.filter(request => request.at >= startedAt) });
-      }, 5_000);
-    });
-  });
+  const idle = await measureIdleRender(page);
   report(CONTROL
     ? 'parked idle, control (postRender fires / 5s)'
     : 'parked idle with infra ON (postRender fires / 5s)', idle);
diff --git a/scripts/qa-traffic-oblique.mjs b/scripts/qa-traffic-oblique.mjs
index 6c2b60072..186a5355f 100644
--- a/scripts/qa-traffic-oblique.mjs
+++ b/scripts/qa-traffic-oblique.mjs
@@ -1,10 +1,13 @@
 #!/usr/bin/env node
 /** Reticle coverage on oblique arrivals: source requests, toggle oracle and zoom revisits. */
 import { whenSettled } from './qa/ready.mjs';
+import {
+  moveTrafficCamera as moveCamera,
+  whenTrafficSettled,
+} from './qa/traffic.mjs';
 import { launchBrowser, closeBrowser } from './qa/browser.mjs';
 import fs from 'node:fs';
 import {
-  moveCamera,
   createScreencast,
   installFrameProbe,
 } from './qa-journey-recorder.mjs';
@@ -96,19 +99,7 @@ try {
         };
       });
     const settle = async () => {
-      await whenSettled(page);
-      await page
-        .waitForFunction(
-          () => {
-            const s = window.__godsEyeView.dataManager.layers
-              .get('traffic')
-              .module.getStats();
-            return !s.loading;
-          },
-          { timeout: 15000 },
-        )
-        .catch(() => {});
-      await whenSettled(page);
+      await whenTrafficSettled(page);
       return snap();
     };
     for (const [name, lat, lon, height] of [
@@ -306,6 +297,11 @@ try {
   fs.writeFileSync(`${out}/result.json`, JSON.stringify(result, null, 2));
   await closeBrowser(browser);
 }
+console.log(JSON.stringify({
+  failures: result.failures,
+  errors: result.errors,
+  forbidden: result.forbidden,
+}));
 if (
   !baseline &&
   (result.failures.length || result.errors.length || result.forbidden.length)
diff --git a/scripts/qa/idle.mjs b/scripts/qa/idle.mjs
new file mode 100644
index 000000000..069d6908b
--- /dev/null
+++ b/scripts/qa/idle.mjs
@@ -0,0 +1,92 @@
+/** Observe a quiet request-mode globe, then measure it without requesting frames. */
+export function measureIdleRender(
+  page,
+  { quietMs = 600, sampleMs = 5000, timeoutMs = 15000 } = {},
+) {
+  return page.evaluate(
+    ({ quietMs, sampleMs, timeoutMs }) =>
+      new Promise((resolve, reject) => {
+        const { engine } = window.__godsEyeView;
+        const started = performance.now();
+        let lastActivity = started;
+        let measuringAt = null;
+        let renders = 0;
+        let framesWithPendingTiles = 0;
+        let tilesLoadedBefore = false;
+        const settlingRequests = {};
+        const requests = {};
+        const original = engine.render.request;
+        const observedRequest = function (reason = 'globe-engine') {
+          const now = performance.now();
+          lastActivity = now;
+          const counts = measuringAt === null ? settlingRequests : requests;
+          const row = (counts[reason] ??= {
+            count: 0,
+            firstMs: now - started,
+            lastMs: 0,
+          });
+          row.count++;
+          row.lastMs = now - started;
+          return original.apply(this, arguments);
+        };
+        engine.render.request = observedRequest;
+        const remove = engine.frames.postRender.addEventListener(() => {
+          lastActivity = performance.now();
+          if (measuringAt === null) return;
+          renders++;
+          if (!engine.surface.tilesLoaded()) framesWithPendingTiles++;
+        });
+        const cleanup = () => {
+          clearInterval(timer);
+          remove();
+          if (engine.render.request === observedRequest)
+            engine.render.request = original;
+        };
+        const timer = setInterval(() => {
+          if (window.__godsEyeView.engine !== engine || engine.isDestroyed()) {
+            cleanup();
+            reject(new Error('Idle observation interrupted: engine changed'));
+            return;
+          }
+          const now = performance.now();
+          const tilesLoaded = engine.surface.tilesLoaded();
+          if (measuringAt === null) {
+            if (
+              !tilesLoaded ||
+              engine.camera.flightActive() ||
+              engine.render.isContinuous()
+            )
+              lastActivity = now;
+            if (now - lastActivity >= quietMs) {
+              measuringAt = now;
+              tilesLoadedBefore = tilesLoaded;
+            } else if (now - started >= timeoutMs) {
+              cleanup();
+              reject(
+                new Error(
+                  `Readiness timeout: idle render; ${JSON.stringify({ tilesLoaded, settlingRequests })}`,
+                ),
+              );
+            }
+            return;
+          }
+          if (now - measuringAt < sampleMs) return;
+          cleanup();
+          const governor =
+            window.__godsEyeView.getRenderGovernorDiagnostics?.();
+          resolve({
+            renders,
+            settleMs: Math.round(measuringAt - started),
+            settlingRequests,
+            requests,
+            tilesLoadedBefore,
+            tilesLoadedAfter: tilesLoaded,
+            framesWithPendingTiles,
+            mode: governor?.mode,
+            holds: governor?.holds,
+          });
+        }, 50);
+      }),
+    { quietMs, sampleMs, timeoutMs },
+  );
+}
diff --git a/scripts/qa/idle.test.mjs b/scripts/qa/idle.test.mjs
new file mode 100644
index 000000000..56437ba30
--- /dev/null
+++ b/scripts/qa/idle.test.mjs
@@ -0,0 +1,112 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createFakeEngine } from '../../src/globe/testing/fakeEngine.js';
+import { measureIdleRender } from './idle.mjs';
+
+function fixture(t) {
+  const engine = createFakeEngine();
+  const previous = globalThis.window;
+  globalThis.window = { __godsEyeView: { engine } };
+  let now = 0;
+  t.mock.method(performance, 'now', () => now);
+  t.mock.timers.enable({ apis: ['setInterval'] });
+  t.after(() => {
+    if (previous === undefined) delete globalThis.window;
+    else globalThis.window = previous;
+    engine.destroy();
+  });
+  return {
+    engine,
+    page: { evaluate: (fn, options) => fn(options) },
+    tick(ms) {
+      now += ms;
+      t.mock.timers.tick(ms);
+    },
+  };
+}
+
+test('idle measurement waits out fades, records reasons, and never requests a frame', async (t) => {
+  const { engine, page, tick } = fixture(t);
+  const original = engine.render.request;
+  const pending = measureIdleRender(page, { quietMs: 100, sampleMs: 200 });
+  engine.render.request('world-overlay');
+  engine.fake.frame();
+  tick(50);
+  engine.render.request('world-overlay');
+  engine.fake.frame();
+  tick(50);
+  tick(50);
+  engine.render.request('hud');
+  engine.fake.frame();
+  tick(200);
+  const result = await pending;
+  assert.equal(result.settleMs, 150);
+  assert.equal(result.renders, 1);
+  assert.equal(result.settlingRequests['world-overlay'].count, 2);
+  assert.equal(result.requests.hud.count, 1);
+  assert.equal(result.framesWithPendingTiles, 0);
+  assert.equal(engine.fake.callsOf('render.request').length, 3);
+  assert.equal(engine.render.request, original);
+  assert.equal(engine.frames.postRender.numberOfListeners, 0);
+  tick(1000);
+  assert.equal(engine.fake.callsOf('render.request').length, 3);
+});
+
+test('persistent render demand fails with its reason and releases instrumentation', async (t) => {
+  const { engine, page, tick } = fixture(t);
+  const original = engine.render.request;
+  const pending = measureIdleRender(page, { quietMs: 100, timeoutMs: 300 });
+  const rejected = assert.rejects(pending, /idle render.*world-overlay/);
+  for (let i = 0; i < 6; i++) {
+    engine.render.request('world-overlay');
+    engine.fake.frame();
+    tick(50);
+  }
+  await rejected;
+  assert.equal(engine.render.request, original);
+  assert.equal(engine.frames.postRender.numberOfListeners, 0);
+  assert.equal(engine.fake.callsOf('render.request').length, 6);
+});
+
+test('continuous mode and pending tiles cannot masquerade as idle', async (t) => {
+  for (const condition of ['continuous', 'tiles']) {
+    await t.test(condition, async (t) => {
+      const { engine, page, tick } = fixture(t);
+      if (condition === 'continuous') engine.render.setContinuous(true);
+      else t.mock.method(engine.surface, 'tilesLoaded', () => false);
+      const pending = measureIdleRender(page, { quietMs: 100, timeoutMs: 300 });
+      const rejected = assert.rejects(
+        pending,
+        /Readiness timeout: idle render/,
+      );
+      tick(300);
+      await rejected;
+      assert.equal(engine.fake.callsOf('render.request').length, 0);
+    });
+  }
+});
+
+test('engine destruction stops the idle observer', async (t) => {
+  const { engine, page, tick } = fixture(t);
+  const original = engine.render.request;
+  const pending = measureIdleRender(page);
+  const rejected = assert.rejects(pending, /engine changed/);
+  engine.destroy();
+  tick(50);
+  await rejected;
+  assert.equal(engine.render.request, original);
+});
+
+test('renders during the sample stay counted even when demand becomes continuous', async (t) => {
+  const { engine, page, tick } = fixture(t);
+  const pending = measureIdleRender(page, { quietMs: 100, sampleMs: 500 });
+  tick(100);
+  for (let i = 0; i < 10; i++) {
+    engine.render.request('world-overlay');
+    engine.fake.frame();
+    tick(50);
+  }
+  const result = await pending;
+  assert.equal(result.renders, 10);
+  assert.equal(result.requests['world-overlay'].count, 10);
+});
diff --git a/scripts/qa/ready.mjs b/scripts/qa/ready.mjs
index 9ea79cf38..ef75ffeb6 100644
--- a/scripts/qa/ready.mjs
+++ b/scripts/qa/ready.mjs
@@ -66,13 +66,18 @@ export async function whenSettled(
 ) {
   const started = Date.now();
   try {
-    await page.waitForFunction(() => window.__godsEyeView?.engine, {
-      timeout: timeoutMs,
-      polling: 50,
-    });
+    const handle = await page.waitForFunction(
+      () => {
+        if (!window.__godsEyeView?.engine) return false;
+        const cover = globalThis.document?.querySelector('#loading-screen');
+        return !cover || getComputedStyle(cover).visibility === 'hidden';
+      },
+      { timeout: timeoutMs, polling: 50 },
+    );
+    await handle?.dispose();
   } catch {
     throw new Error(
-      'Readiness timeout: engineStarted, initialViewRestored, frameDrawn, noFlight, cameraInputsEnabled, cameraPoseStable; observed: inputsEnabled=unknown, following=unknown, cockpitActive=unknown, lastPoseDelta=null',
+      'Readiness timeout: engineStarted, initialViewRestored, startupUiReady, frameDrawn, noFlight, cameraInputsEnabled, cameraPoseStable; observed: inputsEnabled=unknown, following=unknown, cockpitActive=unknown, lastPoseDelta=null',
     );
   }
   return page.evaluate(
@@ -205,7 +210,6 @@ export async function whenTilesLoaded(page, { timeoutMs = 30000 } = {}) {
     () => {
       const engine = window.__godsEyeView?.engine;
       if (!engine || engine.isDestroyed()) return false;
-      engine.render.request('qa-tile-readiness');
       return engine.surface.tilesLoaded();
     },
     { timeout: timeoutMs, polling: 100 },
@@ -217,7 +221,6 @@ export async function whenUiSettled(page) {
   const handle = await page.waitForFunction(
     () => {
       const app = window.__godsEyeView;
-      app?.engine?.render.request('qa-ui-readiness');
       return (
         !app?.styleManager?.transitions?.size &&
         document
diff --git a/scripts/qa/ready.test.mjs b/scripts/qa/ready.test.mjs
index 2f3ca759f..cff54c5bb 100644
--- a/scripts/qa/ready.test.mjs
+++ b/scripts/qa/ready.test.mjs
@@ -4,6 +4,7 @@ import { createFakeEngine } from '../../src/globe/testing/fakeEngine.js';
 import { createSettledState } from '../../src/app/qaProbe.js';
 import {
   waitForSettled,
+  whenSettled,
   whenFramesDrawn,
   whenTilesLoaded,
   whenUiSettled,
@@ -252,3 +253,57 @@ test('scenario polling waits for evidence and identifies an unmet condition', as
     /broken predicate/,
   );
 });
+
+test('camera readiness also waits for the startup cover to stop intercepting clicks', async (t) => {
+  pageEngine(t);
+  const previous = {
+    document: globalThis.document,
+    getComputedStyle: globalThis.getComputedStyle,
+  };
+  let visibility = 'visible';
+  globalThis.document = { querySelector: () => ({}) };
+  globalThis.getComputedStyle = () => ({ visibility });
+  t.after(() => {
+    for (const [key, value] of Object.entries(previous)) {
+      if (value === undefined) delete globalThis[key];
+      else globalThis[key] = value;
+    }
+  });
+  let disposed = false;
+  await whenSettled({
+    async waitForFunction(predicate) {
+      assert.equal(predicate(), false, 'a started engine still has a cover');
+      visibility = 'hidden';
+      assert.equal(predicate(), true);
+      return {
+        dispose: async () => {
+          disposed = true;
+        },
+      };
+    },
+    async evaluate() {
+      assert.equal(disposed, true);
+    },
+  });
+});
+
+test('tile and UI polling never request globe frames', async (t) => {
+  const { engine } = pageEngine(t);
+  const previous = globalThis.document;
+  globalThis.document = { getAnimations: () => [] };
+  t.after(() => {
+    if (previous === undefined) delete globalThis.document;
+    else globalThis.document = previous;
+  });
+  t.mock.method(engine.render, 'request', () => {
+    assert.fail('passive readiness requested a frame');
+  });
+  const page = {
+    async waitForFunction(predicate) {
+      assert.equal(predicate(), true);
+      return { dispose: async () => {} };
+    },
+  };
+  await whenTilesLoaded(page);
+  await whenUiSettled(page);
+});
diff --git a/scripts/qa/traffic.mjs b/scripts/qa/traffic.mjs
new file mode 100644
index 000000000..abc603e0b
--- /dev/null
+++ b/scripts/qa/traffic.mjs
@@ -0,0 +1,69 @@
+import { evaluateWithGeo } from './geometry.mjs';
+import { whenSettled, whenTilesLoaded } from './ready.mjs';
+
+/** Preserve the oblique fixture's native collision and flight-arc settings. */
+export function moveTrafficCamera(page, view, seconds) {
+  return evaluateWithGeo(
+    page,
+    async (geo, view, duration) => {
+      const { engine, viewer } = window.__godsEyeView;
+      const native = engine.kind === 'cesium';
+      const camera = native ? viewer.camera : engine.camera;
+      // These low-altitude fixture poses must not be lifted by native collision.
+      if (native)
+        viewer.scene.screenSpaceCameraController.enableCollisionDetection = false;
+      camera.cancelFlight();
+      await new Promise((resolve) =>
+        camera.flyTo({
+          destination: geo.cartesian3.fromDegrees(
+            view.lon,
+            view.lat,
+            view.height,
+          ),
+          orientation: {
+            heading: ((view.heading ?? 0) * Math.PI) / 180,
+            pitch: ((view.pitch ?? -45) * Math.PI) / 180,
+            roll: 0,
+          },
+          duration,
+          // An automatic high arc crosses the traffic layer's activation ceiling.
+          maximumHeight: Math.max(view.height, engine.camera.height()),
+          complete: resolve,
+          cancel: resolve,
+        }),
+      );
+    },
+    view,
+    seconds,
+  );
+}
+
+/** A quiet loader can still be waiting for its camera-change debounce. */
+export async function whenTrafficSettled(page) {
+  await whenTilesLoaded(page);
+  await whenSettled(page);
+  const handle = await page.waitForFunction(
+    () => {
+      const { engine, dataManager } = window.__godsEyeView;
+      const pose = engine.camera.pose();
+      const viewKey = [
+        pose.cartographic.latitude,
+        pose.cartographic.longitude,
+        pose.cartographic.height / 10000,
+        pose.heading,
+        pose.pitch,
+      ]
+        .map((value) => Number(value || 0).toFixed(7))
+        .join(',');
+      const stats = dataManager.layers.get('traffic').module.getStats();
+      return (
+        stats.roadBounds?.coverage?.viewKey === viewKey &&
+        stats.count > 0 &&
+        !stats.loading &&
+        !stats.surfacePending
+      );
+    },
+    { timeout: 60000, polling: 100 },
+  );
+  await handle.dispose();
+}
diff --git a/scripts/qa/traffic.test.mjs b/scripts/qa/traffic.test.mjs
new file mode 100644
index 000000000..e44a40720
--- /dev/null
+++ b/scripts/qa/traffic.test.mjs
@@ -0,0 +1,116 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createFakeEngine } from '../../src/globe/testing/fakeEngine.js';
+import { moveTrafficCamera, whenTrafficSettled } from './traffic.mjs';
+
+function fixture(t) {
+  const engine = createFakeEngine({ kind: 'cesium' });
+  engine.camera.setView({
+    destination: { x: 6379137, y: 0, z: 0 },
+    orientation: { heading: 0, pitch: -Math.PI / 12, roll: 0 },
+  });
+  const previousWindow = globalThis.window;
+  const previousDocument = globalThis.document;
+  globalThis.window = { __godsEyeView: { engine } };
+  globalThis.document = { querySelector: () => null };
+  t.after(() => {
+    if (previousWindow === undefined) delete globalThis.window;
+    else globalThis.window = previousWindow;
+    if (previousDocument === undefined) delete globalThis.document;
+    else globalThis.document = previousDocument;
+    engine.destroy();
+  });
+  return globalThis.window.__godsEyeView;
+}
+
+test('oblique fixture preserves collision and maximum flight height on Cesium', async (t) => {
+  const app = fixture(t);
+  let flight;
+  let cancelled = false;
+  app.viewer = {
+    scene: { screenSpaceCameraController: { enableCollisionDetection: true } },
+    camera: {
+      cancelFlight() {
+        cancelled = true;
+      },
+      flyTo(options) {
+        flight = options;
+        options.complete();
+      },
+    },
+  };
+  await moveTrafficCamera(
+    { evaluate: (fn, ...args) => fn(...args) },
+    { lon: 55.037, lat: 24.964, height: 276, pitch: -15 },
+    1.4,
+  );
+  assert.equal(cancelled, true);
+  assert.equal(
+    app.viewer.scene.screenSpaceCameraController.enableCollisionDetection,
+    false,
+  );
+  assert.ok(Math.abs(flight.maximumHeight - 1000) < 1e-6);
+  assert.equal(flight.duration, 1.4);
+  assert.equal(flight.orientation.pitch, -Math.PI / 12);
+});
+
+test('traffic readiness rejects old coverage, pending debounce and partial populations', async (t) => {
+  const app = fixture(t);
+  const stats = {
+    count: 0,
+    loading: false,
+    surfacePending: 0,
+    roadBounds: null,
+  };
+  app.dataManager = {
+    layers: new Map([['traffic', { module: { getStats: () => stats } }]]),
+  };
+  let calls = 0;
+  let disposed = 0;
+  await whenTrafficSettled({
+    evaluate: async () => {},
+    async waitForFunction(predicate) {
+      if (++calls < 3) assert.equal(predicate(), true);
+      else {
+        assert.equal(
+          predicate(),
+          false,
+          'idle before the debounce is not loaded',
+        );
+        stats.count = 100;
+        stats.roadBounds = { coverage: { viewKey: 'old view' } };
+        assert.equal(predicate(), false, 'old roads do not cover this camera');
+        stats.roadBounds.coverage.viewKey =
+          '0.0000000,0.0000000,0.1000000,0.0000000,-0.2617994';
+        stats.loading = true;
+        assert.equal(predicate(), false, 'partial road population');
+        stats.loading = false;
+        stats.surfacePending = 1;
+        assert.equal(predicate(), false, 'unresolved surface');
+        stats.surfacePending = 0;
+        assert.equal(predicate(), true);
+      }
+      return {
+        dispose: async () => {
+          disposed++;
+        },
+      };
+    },
+  });
+  assert.equal(disposed, 3);
+});
+
+test('traffic loading timeouts fail the scenario', async (t) => {
+  fixture(t);
+  let calls = 0;
+  await assert.rejects(
+    whenTrafficSettled({
+      evaluate: async () => {},
+      async waitForFunction() {
+        if (++calls === 3) throw new Error('traffic loading timeout');
+        return { dispose: async () => {} };
+      },
+    }),
+    /traffic loading timeout/,
+  );
+});