cars: add time-based traffic profile with weekend and Sunday peaks

config.js

@@ -317,7 +317,28 @@ window.CONFIG = {
         spreadFloor: 0.30,        // share that far side roads keep
         speed: 1.0,               // flow speed multiplier
         density: 1.0,             // vehicle density multiplier
-        brightness: 1.3           // vehicle light intensity
+        brightness: 1.3,          // vehicle light intensity
+        // Time-based traffic profile. Values are multipliers around the
+        // configured density. Times are local scene-clock hours.
+        timeProfile: {
+            enabled: true,
+            weekday: 1.0,         // Mon-Fri base traffic
+            saturday: 0.65,       // weekend reduction
+            sunday: 0.55,         // weekend reduction
+            morningPeak: 7.7,     // rush-hour morning peak
+            morningWidth: 1.2,    // gaussian sigma in hours
+            morningGain: 0.55,    // +55 % at the peak
+            eveningPeak: 17.5,    // rush-hour evening peak
+            eveningWidth: 1.4,
+            eveningGain: 0.75,    // +75 % at the peak
+            fridayEveningGain: 0.35,
+            sundayEveningPeak: 18.5,
+            sundayEveningWidth: 1.8,
+            sundayEveningGain: 0.85, // commuter return traffic
+            nightReduction: 0.70  // deep-night traffic reduced to 30 %
+            // timeProfile: { enabled: false }
+            // timeProfile: { morningGain: 0.8, eveningGain: 1.0, nightReduction: 0.85 }
+        }
         // speed: 2.0, density: 0.6, brightness: 1.0
     },