diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
index 84dd9e9..ba8e342 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
@@ -63,7 +63,7 @@ public class DijkstraAlgorithm extends ShortestPathAlgorithm {
             notifyNodeMarked(x.getNode());
             // System.out.println(x.getCost()); // Pour vérifier une croissance des noeuds marqués
             // We create a list of node successors of x, instead of a list of Arcs.
-            float arc_cost = 0;
+            double arc_cost = 0;
             for (Arc successorArc : x.getNode().getSuccessors()) {
                 Label successor = labels.get(successorArc.getDestination().getId());
 
@@ -76,11 +76,11 @@ public class DijkstraAlgorithm extends ShortestPathAlgorithm {
                             // data.getcost(arc) returns a cost considering the mode chosen:
                             // TIME or LENGTH
                             // Similar to using getLength / getMinimumTravelTime
-                            arc_cost = (float) data.getCost(arc);
+                            arc_cost = data.getCost(arc);
                         }
                     }
                     
-                    final float possible_path_cost = x.getCost() + arc_cost;
+                    final double possible_path_cost = x.getCost() + arc_cost;
                     if (successor.getCost() > possible_path_cost) {
                         // Mise à jour du label
                         successor.setPathCost(possible_path_cost);
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java
index bdc3da7..bf8d6e6 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java
@@ -7,7 +7,7 @@ public class Label implements Comparable<Label> {
   Node node;
   boolean marked;
   boolean reached;
-  float pathCost;
+  double pathCost;
   Node parentNode;
 
 
@@ -15,7 +15,7 @@ public class Label implements Comparable<Label> {
     this.node = node;
     this.marked = false;
     this.marked = false;
-    this.pathCost = Float.MAX_VALUE;
+    this.pathCost = Double.MAX_VALUE;
     this.parentNode = null;
   }
 
@@ -24,24 +24,24 @@ public class Label implements Comparable<Label> {
   public void mark() { this.marked = true; }
   public boolean isReached() { return this.reached; }
   public void markReached() { this.reached = true; }
-  public float getPathCost() { return this.pathCost; }
-  public void setPathCost(float newCost) { this.pathCost = newCost; }
+  public double getPathCost() { return this.pathCost; }
+  public void setPathCost(double newCost) { this.pathCost = newCost; }
   public Node getParentNode() { return this.parentNode; }
   public void setParentNode(Node parentNode) { this.parentNode = parentNode; }
 
-  public float getCost() {
+  public double getCost() {
     // function will be modified later
     
     return pathCost;
   }
 
-  public float getTotalCost() {
+  public double getTotalCost() {
     // will be overriden for A*
     return pathCost;
   }
 
   public int compareTo(Label other) {
-    final float difference = this.getTotalCost() - other.getTotalCost();
+    final double difference = this.getTotalCost() - other.getTotalCost();
     return (int) Math.signum(difference);
   }
 }
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/LabelStar.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/LabelStar.java
index 4c03d2c..4c20fc7 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/LabelStar.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/LabelStar.java
@@ -6,7 +6,7 @@ import org.insa.graphs.algorithm.AbstractInputData.Mode;
 import org.insa.graphs.model.RoadInformation;
 
 public class LabelStar extends Label {
-  private float distanceToDestination;
+  private double distanceToDestination;
   private int MaximumSpeed;
 
   public LabelStar(Node node, int MaximumSpeed, Node destination) {
@@ -14,15 +14,15 @@ public class LabelStar extends Label {
     this.MaximumSpeed = MaximumSpeed;
     // precision was never an answer
     if (this.MaximumSpeed < 0) {
-      distanceToDestination = (float) Point.distance(node.getPoint(), destination.getPoint());
+      distanceToDestination = (double) Point.distance(node.getPoint(), destination.getPoint());
     }
     else {
-      distanceToDestination = (float) Point.distance(node.getPoint(), destination.getPoint()) / (1000 * MaximumSpeed);
+      distanceToDestination = (double) Point.distance(node.getPoint(), destination.getPoint()) / (1000 * MaximumSpeed);
     }
   }
 
   @Override
-  public float getTotalCost() {
+  public double getTotalCost() {
     return this.getCost() + distanceToDestination;
   }
 
@@ -32,7 +32,7 @@ public class LabelStar extends Label {
    * "En cas d'égalité, on considèrera en premier le sommet ayant le plus petit coût estimé à la destination."
    */
   public int compareTo(Label other) {
-    final float difference = this.getTotalCost() - other.getTotalCost();
+    final double difference = this.getTotalCost() - other.getTotalCost();
     int retour =  (int) Math.signum(difference);
     if (Math.abs(difference) < 0.01) {
       // En cas d'égalité:
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathAlgorithm.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathAlgorithm.java
index c7ccce0..c9d60d4 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathAlgorithm.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathAlgorithm.java
@@ -5,7 +5,7 @@ import org.insa.graphs.model.Node;
 
 public abstract class ShortestPathAlgorithm extends AbstractAlgorithm<ShortestPathObserver> {
 
-    protected float pathCost;
+    protected double pathCost;
 
     protected ShortestPathAlgorithm(ShortestPathData data) {
         super(data);
@@ -69,7 +69,7 @@ public abstract class ShortestPathAlgorithm extends AbstractAlgorithm<ShortestPa
         }
     }
 
-    public float getCostPath() {
+    public double getCostPath() {
         return this.pathCost;
     }
 }