diff --git a/config.js b/config.js
index 06f09a9..d3d7865 100644
--- a/config.js
+++ b/config.js
@@ -134,7 +134,7 @@ window.CONFIG = {
         rankMax: 1,             // 0=city, 1=town
         color: [0.22, 0.55, 1.0],
         flashHz: 2.2,
-        nightOnly: true,
+        nightOnly: false,
         bright: 1.35
         // emergencyVehicles: { enabled: false }
         // emergencyVehicles: { count: 6, speedKmh: 110, minKm: 25, maxKm: 120 }
diff --git a/vendor/clouds3d.js b/vendor/clouds3d.js
index e4ad434..bca09a3 100644
--- a/vendor/clouds3d.js
+++ b/vendor/clouds3d.js
@@ -4256,11 +4256,59 @@ var CARP_FRAG_SRC = [
         // piece in the evening and goes dark piece by piece in the morning.
         'float thr = mix(uLightHi, uLightLo, hash1(vSeed * 1.618 + 5.13));',
         'float lit = 1.0 - smoothstep(thr - uLightSoft, thr + uLightSoft, uSunAlt);',
+        'if (uEmergency > 0.5 && uEmergencyNightOnly < 0.5) lit = 1.0;',
         'if (lit <= 0.001) discard;',
         'gl_FragColor = vec4(col * inten * g * lit * df, 1.0);',
     '}'
 ].join('\n');
 
+function ensureCarPtsProgram(gl) {
+    if (carPtsProg) return carPtsProg;
+    var cpp = makeProgram(gl, CARP_VERT_SRC, CARP_FRAG_SRC);
+    if (!cpp) return null;
+    carPtsProg = cpp;
+    carPtsAttribs = {
+        pos: gl.getAttribLocation(cpp, 'aPos'),
+        meta: gl.getAttribLocation(cpp, 'aMeta'),
+        dens: gl.getAttribLocation(cpp, 'aDens'),
+        seed: gl.getAttribLocation(cpp, 'aSeed'),
+        len: gl.getAttribLocation(cpp, 'aLen')
+    };
+    carPtsUniforms = {
+        proj: gl.getUniformLocation(cpp, 'uProj'),
+        view: gl.getUniformLocation(cpp, 'uView'),
+        camPos: gl.getUniformLocation(cpp, 'uCamPos'),
+        earthRadius: gl.getUniformLocation(cpp, 'uEarthRadius'),
+        curvatureOn: gl.getUniformLocation(cpp, 'uCurvatureOn'),
+        time: gl.getUniformLocation(cpp, 'uTime'),
+        night: gl.getUniformLocation(cpp, 'uNight'),
+        speed: gl.getUniformLocation(cpp, 'uSpeed'),
+        dash: gl.getUniformLocation(cpp, 'uDash'),
+        laneW: gl.getUniformLocation(cpp, 'uLaneW'),
+        lanePx: gl.getUniformLocation(cpp, 'uLanePx'),
+        pxW: gl.getUniformLocation(cpp, 'uPxW'),
+        traffic: gl.getUniformLocation(cpp, 'uTraffic'),
+        minPx: gl.getUniformLocation(cpp, 'uMinPx'),
+        maxPx: gl.getUniformLocation(cpp, 'uMaxPx'),
+        boost: gl.getUniformLocation(cpp, 'uBoost'),
+        dens: gl.getUniformLocation(cpp, 'uDens'),
+        bright: gl.getUniformLocation(cpp, 'uBright'),
+        fadeA: gl.getUniformLocation(cpp, 'uFadeA'),
+        fadeB: gl.getUniformLocation(cpp, 'uFadeB'),
+        sunAlt: gl.getUniformLocation(cpp, 'uSunAlt'),
+        lightHi: gl.getUniformLocation(cpp, 'uLightHi'),
+        lightLo: gl.getUniformLocation(cpp, 'uLightLo'),
+        lightSoft: gl.getUniformLocation(cpp, 'uLightSoft'),
+        wet: gl.getUniformLocation(cpp, 'uWet'),
+        wetGain: gl.getUniformLocation(cpp, 'uWetGain'),
+        emergency: gl.getUniformLocation(cpp, 'uEmergency'),
+        emergencyColor: gl.getUniformLocation(cpp, 'uEmergencyColor'),
+        emergencyFlashHz: gl.getUniformLocation(cpp, 'uEmergencyFlashHz'),
+        emergencyNightOnly: gl.getUniformLocation(cpp, 'uEmergencyNightOnly')
+    };
+    return cpp;
+}
+
 // ---- Off-main-thread geo build -------------------------------------------
 // Chain stitching, the motorway distance field and the car/settlement
 // ribbon geometry are pure functions of plain data, so they run in a Web
@@ -7148,51 +7196,7 @@ window.clouds3dRender = function(target) {
         carDrawGroup(carVboB, carCountB, CAR_B_DENS);
         // -- vehicle lights: round point sprites --
         if (carPtsCountM || carPtsCountB) {
-            if (!carPtsProg) {
-                var cpp = makeProgram(gl, CARP_VERT_SRC, CARP_FRAG_SRC);
-                if (cpp) {
-                    carPtsProg = cpp;
-                    carPtsAttribs = {
-                        pos: gl.getAttribLocation(cpp, 'aPos'),
-                        meta: gl.getAttribLocation(cpp, 'aMeta'),
-                        dens: gl.getAttribLocation(cpp, 'aDens'),
-                        seed: gl.getAttribLocation(cpp, 'aSeed'),
-                        len: gl.getAttribLocation(cpp, 'aLen')
-                    };
-                    carPtsUniforms = {
-                        proj: gl.getUniformLocation(cpp, 'uProj'),
-                        view: gl.getUniformLocation(cpp, 'uView'),
-                        camPos: gl.getUniformLocation(cpp, 'uCamPos'),
-                        earthRadius: gl.getUniformLocation(cpp, 'uEarthRadius'),
-                        curvatureOn: gl.getUniformLocation(cpp, 'uCurvatureOn'),
-                        time: gl.getUniformLocation(cpp, 'uTime'),
-                        night: gl.getUniformLocation(cpp, 'uNight'),
-                        speed: gl.getUniformLocation(cpp, 'uSpeed'),
-                        dash: gl.getUniformLocation(cpp, 'uDash'),
-                        laneW: gl.getUniformLocation(cpp, 'uLaneW'),
-                        lanePx: gl.getUniformLocation(cpp, 'uLanePx'),
-                        pxW: gl.getUniformLocation(cpp, 'uPxW'),
-                        traffic: gl.getUniformLocation(cpp, 'uTraffic'),
-                        minPx: gl.getUniformLocation(cpp, 'uMinPx'),
-                        maxPx: gl.getUniformLocation(cpp, 'uMaxPx'),
-                        boost: gl.getUniformLocation(cpp, 'uBoost'),
-                        dens: gl.getUniformLocation(cpp, 'uDens'),
-                        bright: gl.getUniformLocation(cpp, 'uBright'),
-                        fadeA: gl.getUniformLocation(cpp, 'uFadeA'),
-                        fadeB: gl.getUniformLocation(cpp, 'uFadeB'),
-                        sunAlt: gl.getUniformLocation(cpp, 'uSunAlt'),
-                        lightHi: gl.getUniformLocation(cpp, 'uLightHi'),
-                        lightLo: gl.getUniformLocation(cpp, 'uLightLo'),
-                        lightSoft: gl.getUniformLocation(cpp, 'uLightSoft'),
-                        wet: gl.getUniformLocation(cpp, 'uWet'),
-                        wetGain: gl.getUniformLocation(cpp, 'uWetGain'),
-                        emergency: gl.getUniformLocation(cpp, 'uEmergency'),
-                        emergencyColor: gl.getUniformLocation(cpp, 'uEmergencyColor'),
-                        emergencyFlashHz: gl.getUniformLocation(cpp, 'uEmergencyFlashHz'),
-                        emergencyNightOnly: gl.getUniformLocation(cpp, 'uEmergencyNightOnly')
-                    };
-                }
-            }
+            ensureCarPtsProgram(gl);
             if (carPtsProg) {
                 gl.useProgram(carPtsProg);
                 gl.uniformMatrix4fv(carPtsUniforms.proj, false, proj);
@@ -7246,25 +7250,64 @@ window.clouds3dRender = function(target) {
                 };
                 carPtsGroup(carPtsVboM, carPtsCountM, CAR_M_DASH, CAR_M_SPEED, CAR_M_DENS);
                 carPtsGroup(carPtsVboB, carPtsCountB, CAR_B_DASH, CAR_B_SPEED, CAR_B_DENS);
-                var emergencyDrawCount = updateEmergencyVehicles(now);
-                if (emergencyDrawCount > 0) {
-                    if (!emergencyVbo) emergencyVbo = gl.createBuffer();
-                    gl.bindBuffer(gl.ARRAY_BUFFER, emergencyVbo);
-                    gl.bufferData(gl.ARRAY_BUFFER, emergencyPts.subarray(0, emergencyDrawCount * 10), gl.DYNAMIC_DRAW);
-                    gl.vertexAttribPointer(carPtsAttribs.pos, 3, gl.FLOAT, false, 40, 0);
-                    gl.vertexAttribPointer(carPtsAttribs.meta, 4, gl.FLOAT, false, 40, 12);
-                    gl.vertexAttribPointer(carPtsAttribs.dens, 1, gl.FLOAT, false, 40, 28);
-                    gl.vertexAttribPointer(carPtsAttribs.seed, 1, gl.FLOAT, false, 40, 32);
-                    gl.vertexAttribPointer(carPtsAttribs.len, 1, gl.FLOAT, false, 40, 36);
-                    gl.uniform1f(carPtsUniforms.dash, 0.0);
-                    gl.uniform1f(carPtsUniforms.speed, 0.0);
-                    gl.uniform1f(carPtsUniforms.dens, 1.0);
-                    gl.uniform1f(carPtsUniforms.bright, EMERGENCY_BRIGHT);
-                    gl.uniform1f(carPtsUniforms.emergency, 1.0);
-                    gl.drawArrays(gl.POINTS, 0, emergencyDrawCount);
-                    gl.uniform1f(carPtsUniforms.emergency, 0.0);
-                    gl.uniform1f(carPtsUniforms.bright, CAR_BRIGHT);
-                }
+
+            }
+        }
+        var emergencyDrawCount = updateEmergencyVehicles(now);
+        if (emergencyDrawCount > 0 && (!EMERGENCY_NIGHT_ONLY || carNight > 0.01)) {
+            ensureCarPtsProgram(gl);
+            if (carPtsProg) {
+                var emergencyPxScale = Math.max(0.45, Math.min(1.25, gl.drawingBufferHeight / 1080));
+                gl.useProgram(carPtsProg);
+                gl.uniformMatrix4fv(carPtsUniforms.proj, false, proj);
+                gl.uniformMatrix4fv(carPtsUniforms.view, false, view);
+                gl.uniform3f(carPtsUniforms.camPos, camX, camY, camZ);
+                gl.uniform1f(carPtsUniforms.earthRadius, EARTH_RADIUS_UNITS);
+                gl.uniform1f(carPtsUniforms.curvatureOn, CURVATURE_ON ? 1.0 : 0.0);
+                gl.uniform1f(carPtsUniforms.time, now);
+                gl.uniform1f(carPtsUniforms.night, carNight);
+                gl.uniform1f(carPtsUniforms.sunAlt, window.__currentSunAlt || 0);
+                gl.uniform1f(carPtsUniforms.lightHi, LIGHT_HI);
+                gl.uniform1f(carPtsUniforms.lightLo, LIGHT_LO);
+                gl.uniform1f(carPtsUniforms.lightSoft, LIGHT_SOFT);
+                gl.uniform1f(carPtsUniforms.laneW, CAR_LANE_W);
+                gl.uniform1f(carPtsUniforms.lanePx, CAR_LANE_PX * emergencyPxScale);
+                gl.uniform1f(carPtsUniforms.pxW, 1.1547 / gl.drawingBufferHeight);
+                gl.uniform1f(carPtsUniforms.traffic, CAR_TRAFFIC);
+                gl.uniform1f(carPtsUniforms.minPx, CAR_MIN_PX * emergencyPxScale * 1.35);
+                gl.uniform1f(carPtsUniforms.maxPx, CAR_MAX_PX * emergencyPxScale * 1.6);
+                gl.uniform1f(carPtsUniforms.boost, CAR_BOOST * emergencyPxScale * 1.4);
+                gl.uniform1f(carPtsUniforms.bright, EMERGENCY_BRIGHT);
+                gl.uniform1f(carPtsUniforms.fadeA, CAR_FADE_A);
+                gl.uniform1f(carPtsUniforms.fadeB, CAR_FADE_B);
+                gl.uniform1f(carPtsUniforms.wet, _roadWet);
+                gl.uniform1f(carPtsUniforms.wetGain, WET_LIGHT_GAIN);
+                gl.uniform1f(carPtsUniforms.emergency, 1.0);
+                gl.uniform3f(carPtsUniforms.emergencyColor, EMERGENCY_COLOR[0], EMERGENCY_COLOR[1], EMERGENCY_COLOR[2]);
+                gl.uniform1f(carPtsUniforms.emergencyFlashHz, EMERGENCY_FLASH_HZ);
+                gl.uniform1f(carPtsUniforms.emergencyNightOnly, EMERGENCY_NIGHT_ONLY ? 1.0 : 0.0);
+                gl.uniform1f(carPtsUniforms.dash, 0.0);
+                gl.uniform1f(carPtsUniforms.speed, 0.0);
+                gl.uniform1f(carPtsUniforms.dens, 1.0);
+                gl.enable(gl.DEPTH_TEST);
+                gl.depthMask(false);
+                gl.enable(gl.BLEND);
+                gl.blendFunc(gl.ONE, gl.ONE);
+                if (!emergencyVbo) emergencyVbo = gl.createBuffer();
+                gl.bindBuffer(gl.ARRAY_BUFFER, emergencyVbo);
+                gl.bufferData(gl.ARRAY_BUFFER, emergencyPts.subarray(0, emergencyDrawCount * 10), gl.DYNAMIC_DRAW);
+                gl.enableVertexAttribArray(carPtsAttribs.pos);
+                gl.vertexAttribPointer(carPtsAttribs.pos, 3, gl.FLOAT, false, 40, 0);
+                gl.enableVertexAttribArray(carPtsAttribs.meta);
+                gl.vertexAttribPointer(carPtsAttribs.meta, 4, gl.FLOAT, false, 40, 12);
+                gl.enableVertexAttribArray(carPtsAttribs.dens);
+                gl.vertexAttribPointer(carPtsAttribs.dens, 1, gl.FLOAT, false, 40, 28);
+                gl.enableVertexAttribArray(carPtsAttribs.seed);
+                gl.vertexAttribPointer(carPtsAttribs.seed, 1, gl.FLOAT, false, 40, 32);
+                gl.enableVertexAttribArray(carPtsAttribs.len);
+                gl.vertexAttribPointer(carPtsAttribs.len, 1, gl.FLOAT, false, 40, 36);
+                gl.drawArrays(gl.POINTS, 0, emergencyDrawCount);
+                gl.uniform1f(carPtsUniforms.emergency, 0.0);
             }
         }
         gl.disable(gl.BLEND);