diff --git a/Assets/Scenes/SampleScene.unity b/Assets/Scenes/SampleScene.unity
index a15a27f..224607c 100644
--- a/Assets/Scenes/SampleScene.unity
+++ b/Assets/Scenes/SampleScene.unity
@@ -235,6 +235,7 @@
   power: 1000
   totalTravelTime: 0
   totalCars: 0
+  trafficLights: {fileID: 128843417}
 --- !u!4 &128843416
 Transform:
   m_ObjectHideFlags: 0
@@ -266,6 +267,7 @@
   mode: 0
   greenTime: 10
   redTime: 2
+  lightPhase: 1
 --- !u!1 &140411785
 GameObject:
   m_ObjectHideFlags: 0

diff --git a/Assets/Scenes/SampleScene.unity b/Assets/Scenes/SampleScene.unity
index a15a27f..224607c 100644
--- a/Assets/Scenes/SampleScene.unity
+++ b/Assets/Scenes/SampleScene.unity
@@ -235,6 +235,7 @@
   power: 1000
   totalTravelTime: 0
   totalCars: 0
+  trafficLights: {fileID: 128843417}
 --- !u!4 &128843416
 Transform:
   m_ObjectHideFlags: 0
@@ -266,6 +267,7 @@
   mode: 0
   greenTime: 10
   redTime: 2
+  lightPhase: 1
 --- !u!1 &140411785
 GameObject:
   m_ObjectHideFlags: 0
diff --git a/Assets/Scripts/Config.cs b/Assets/Scripts/Config.cs
index 2ec9709..f764b52 100644
--- a/Assets/Scripts/Config.cs
+++ b/Assets/Scripts/Config.cs
@@ -14,6 +14,7 @@
     public float totalTravelTime = 0f;
     public int totalCars = 0;
     public RoadNetwork roadNetwork = new RoadNetwork();
+    public TrafficLights trafficLights;
 
     public void click(Mode mode, int index) {
         onClick();

diff --git a/Assets/Scenes/SampleScene.unity b/Assets/Scenes/SampleScene.unity
index a15a27f..224607c 100644
--- a/Assets/Scenes/SampleScene.unity
+++ b/Assets/Scenes/SampleScene.unity
@@ -235,6 +235,7 @@
   power: 1000
   totalTravelTime: 0
   totalCars: 0
+  trafficLights: {fileID: 128843417}
 --- !u!4 &128843416
 Transform:
   m_ObjectHideFlags: 0
@@ -266,6 +267,7 @@
   mode: 0
   greenTime: 10
   redTime: 2
+  lightPhase: 1
 --- !u!1 &140411785
 GameObject:
   m_ObjectHideFlags: 0
diff --git a/Assets/Scripts/Config.cs b/Assets/Scripts/Config.cs
index 2ec9709..f764b52 100644
--- a/Assets/Scripts/Config.cs
+++ b/Assets/Scripts/Config.cs
@@ -14,6 +14,7 @@
     public float totalTravelTime = 0f;
     public int totalCars = 0;
     public RoadNetwork roadNetwork = new RoadNetwork();
+    public TrafficLights trafficLights;
 
     public void click(Mode mode, int index) {
         onClick();
diff --git a/Assets/Scripts/Roads/Roads.cs b/Assets/Scripts/Roads/Roads.cs
index 983c56a..1c60c10 100644
--- a/Assets/Scripts/Roads/Roads.cs
+++ b/Assets/Scripts/Roads/Roads.cs
@@ -97,12 +97,18 @@
             }
             drawMode = DrawMode.DragRoad;
             customNode.lightPhase++;
+            customNode.isPassable = customNode.lightPhase == 0 || 
+                                    customNode.lightPhase == config.trafficLights.lightPhase &&
+                                    config.trafficLights.mode == TrafficLightMode.Green;
         } else if (Input.GetAxis("Fire2") != 0.0f) {
             if (drawMode == DrawMode.DragRoad) {
                 return;
             }
-            customNode.lightPhase--;
             drawMode = DrawMode.DragRoad;
+            customNode.lightPhase--;
+            customNode.isPassable = customNode.lightPhase == 0 || 
+                        customNode.lightPhase == config.trafficLights.lightPhase &&
+                        config.trafficLights.mode == TrafficLightMode.Green;
         } else {
             drawMode = DrawMode.None;
         }