diff --git a/CarController.py b/CarController.py
index 4b07812..e0a3f96 100644
--- a/CarController.py
+++ b/CarController.py
@@ -205,3 +205,6 @@ class CarController:
             return
         for car in self.cars:
             car.__dict__[name] = val
+
+    def getFlowBacklog(self):
+        return sum([f.backlog(self.t) for f in self.flows])
diff --git a/Flow.py b/Flow.py
index 55ce6fb..c7adf6c 100644
--- a/Flow.py
+++ b/Flow.py
@@ -33,3 +33,7 @@ class Flow:
 
     def addCar2Counter(self):
         self.carsSpawned += 1
+
+    def backlog(self, t):
+        carSpawnedTh = self.adjVPH * (t/3600)
+        return carSpawnedTh - self.carsSpawned
diff --git a/main.py b/main.py
index fee918b..3deaf08 100644
--- a/main.py
+++ b/main.py
@@ -84,7 +84,8 @@ class MainWindow(QMainWindow):
             return
         averageTimeStopped = controller.totalStopped / controller.carsDestroyed
         speedPercentage = controller.speedPercentageTotal / controller.carsDestroyed
-        widget.setText(f"temps d'arrêt : {averageTimeStopped:.2f}s/voiture \n nombre de voitures qui n'ont pas pu apparaitre : {controller.spawnFailed} \n <vitesse/vitesse max>T : {speedPercentage:.2f}")
+        newline = '\n'
+        widget.setText(f"temps d'arrêt : {averageTimeStopped:.2f}s/voiture \n<vitesse/vitesse max>T : {speedPercentage:.2f} \nbacklog total : {controller.getFlowBacklog():.2f} \n{newline.join(f'{f.id} : {f.backlog(controller.t):.2f}' for f in controller.flows)}")
 
     @Slot(int)
     def updatePhysicsFps(self,t):