diff --git a/background.html b/background.html
index abdfb92..dc614ee 100644
--- a/background.html
+++ b/background.html
@@ -379,6 +379,7 @@
             </div>
             <div class="debug-row"><span class="debug-label">Time:</span> <span id="dbg-time">--</span></div>
             <div class="debug-row"><span class="debug-label">Day%:</span> <span id="dbg-day">--</span></div>
+            <div class="debug-row"><span class="debug-label">Emergency:</span> <span id="dbg-emergency">--</span></div>
             <div class="debug-row">
                 <span class="debug-label">Weather:</span>
                 <span id="dbg-weather">--</span>
@@ -663,8 +664,8 @@ window.addEventListener('resize', scheduleFitInfoPanel);
         var SIM_SPEED = (function () {
             var d = (window.CONFIG && window.CONFIG.day) || {};
             var hs = parseFloat(_hashParams.speed);
-            if (!isNaN(hs) && hs > 0) return hs;
-            if (typeof d.speed === 'number' && d.speed > 0) return d.speed;
+            if (!isNaN(hs) && hs >= 0) return hs;
+            if (typeof d.speed === 'number' && d.speed >= 0) return d.speed;
             // legacy: cycleSeconds used to mean "seconds per simulated day"
             if (typeof d.cycleSeconds === 'number' && d.cycleSeconds > 0) return 86400 / d.cycleSeconds;
             return 1;
@@ -1835,6 +1836,20 @@ window.weatherThemes = {
             document.getElementById('dbg-time').textContent =
                 (hh < 10 ? '0' : '') + hh + ':' + (mm < 10 ? '0' : '') + mm + ':' + (ss < 10 ? '0' : '') + ss;
             document.getElementById('dbg-day').textContent = realDayProgress != null ? (realDayProgress * 100).toFixed(1) + '%' : (t * 100).toFixed(1) + '%';
+            var ed = window.__emergencyDbg || {};
+            var ev = window.__emergencyVehiclesDebug || [];
+            var emergencyText = 'off';
+            if (ed.enabled) {
+                emergencyText = (ev.length || 0) + ' veh';
+                if (ed.startCity) emergencyText += ' | start ' + ed.startCity.km + ' km';
+                if (ed.poolMode) emergencyText += ' | ' + ed.poolMode + '/' + (ed.candidates || 0);
+                if (ev.length) {
+                    emergencyText += ' | ' + ev.map(function (v) {
+                        return v.routeKm + ' km ' + (v.progressKm != null ? v.progressKm.toFixed(1) : '--') + ' km ' + (v.dir > 0 ? 'out' : 'back');
+                    }).join(', ');
+                }
+            }
+            document.getElementById('dbg-emergency').textContent = emergencyText;
             document.getElementById('dbg-weather').textContent =
                 currentWeatherCode + ' (' + (window.weatherThemes[themeName] ? themeName : '?') + ')'
                 + (window.__weatherStale ? ' cache' : '');
diff --git a/vendor/clouds3d.js b/vendor/clouds3d.js
index 1cca77f..e4ad434 100644
--- a/vendor/clouds3d.js
+++ b/vendor/clouds3d.js
@@ -3669,6 +3669,17 @@ function updateEmergencyVehicles(now) {
         emergencyPts[pi++] = v.seed; emergencyPts[pi++] = route.len;
     }
     emergencyCount = pi / 10;
+    window.__emergencyVehiclesDebug = [];
+    for (var d = 0; d < emergencyVehicles.length; d++) {
+        var vv = emergencyVehicles[d], rr = emergencyRoutes[vv.route];
+        if (!rr) continue;
+        window.__emergencyVehiclesDebug.push({
+            routeKm: +(rr.lenKm).toFixed(1),
+            progressKm: +(vv.d * KM_PER_TILE).toFixed(1),
+            dir: vv.dir,
+            seed: +vv.seed.toFixed(3)
+        });
+    }
     return emergencyCount;
 }