diff --git a/src/main/java/fr/u_paris/gla/project/idfm/IDFMNetworkExtractor.java b/src/main/java/fr/u_paris/gla/project/idfm/IDFMNetworkExtractor.java
index 55e0bc2..7791003 100644
--- a/src/main/java/fr/u_paris/gla/project/idfm/IDFMNetworkExtractor.java
+++ b/src/main/java/fr/u_paris/gla/project/idfm/IDFMNetworkExtractor.java
@@ -10,6 +10,7 @@ import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.io.IOException;
+import java.io.File;
 import java.text.MessageFormat;
 import java.util.*;
 import java.util.Map.Entry;
@@ -46,6 +47,10 @@ public class IDFMNetworkExtractor {
     private static final int IDFM_STOPS_LON_INDEX = 6;
     private static final int IDFM_STOPS_LAT_INDEX = 7;
 
+    private static final String TRACE_FILE_NAME = "trace.csv";
+
+    private static final String HOURS_FILE_NAME = "hours.csv";
+
     // Magically chosen values
     /**
      * A number of stops on each line
@@ -181,6 +186,82 @@ public class IDFMNetworkExtractor {
         }
     }
 
+    public static boolean checkFileExistence(String filePath) {
+        File file = new File(filePath);
+        if (file.exists()) {
+            LOGGER.severe(filePath+ " already exists.");
+            return true;
+        } else {
+            LOGGER.severe(filePath + " does not exist.");
+            return false;
+        }
+    }
+
+    public static void builFiles() {
+
+        if (checkFileExistence("./"+HOURS_FILE_NAME) && checkFileExistence("./"+TRACE_FILE_NAME)) {
+            LOGGER.severe("Files already exists.");
+            return;
+        }
+
+        Map<String, TraceEntry> traces = new HashMap<>();
+        try {
+            CSVTools.readCSVFromURL(TRACE_FILE_URL,
+                    (String[] line) -> addLine(line, traces));
+        } catch (IOException e) {
+            LOGGER.log(Level.SEVERE, "Error while reading the line paths", e);
+        }
+
+        List<StopEntry> stops = new ArrayList<>(traces.size() * GUESS_STOPS_BY_LINE);
+        try {
+            CSVTools.readCSVFromURL(STOPS_FILE_URL,
+                    (String[] line) -> addStop(line, traces, stops));
+        } catch (IOException e) {
+            LOGGER.log(Level.SEVERE, "Error while reading the stops", e);
+        }
+
+        cleanTraces(traces);
+
+        Map<String, Transport> transports = new HashMap<>();
+        CSVStreamProvider provider = new CSVStreamProvider(traces.values().iterator(), transports);
+
+        // Write into args[0]
+        try {
+            CSVTools.writeCSVToFile(TRACE_FILE_NAME, Stream.iterate(provider.next(),
+                    t -> provider.hasNext(), t -> provider.next()));
+        } catch (IOException e) {
+            LOGGER.log(Level.SEVERE, e,
+                    () -> MessageFormat.format("Could not write in file {0}", TRACE_FILE_NAME));
+        }
+
+        System.out.println("******************Building bifurcations ************************");
+        long startTime = System.currentTimeMillis();
+
+        for (Transport entry : transports.values()) {
+            entry.buildBifurcationOptimzed();
+        }
+
+        long endTime = System.currentTimeMillis();
+        long tempsPasse = endTime - startTime;
+
+        long minutes = (tempsPasse / 1000) / 60;
+        long seconds = (tempsPasse / 1000) % 60;
+        long milliseconds = tempsPasse % 1000;
+
+        System.out.println("Temps écoulé : " + minutes + " minutess, " + seconds + " secndes et " + milliseconds + " millis");
+
+        System.out.println("******************Fin Building bifurcations ************************");
+
+        CSVSchedulesProvider providerschedules = new CSVSchedulesProvider(transports.values().iterator());
+        try {
+            CSVTools.writeCSVToFile(HOURS_FILE_NAME, Stream.iterate(providerschedules.next(),
+                    t -> providerschedules.hasNext(), t -> providerschedules.next()));
+        } catch (IOException e) {
+            LOGGER.log(Level.SEVERE, e,
+                    () -> MessageFormat.format("Could not write in file {0}", HOURS_FILE_NAME));
+        }
+    }
+
     private static void cleanTraces(Map<String, TraceEntry> traces) {
         Set<String> toRemove = new HashSet<>();
         for (Entry<String, TraceEntry> traceEntry : traces.entrySet()) {
diff --git a/src/main/java/fr/u_paris/gla/project/itinerary/ItineraryCalculator.java b/src/main/java/fr/u_paris/gla/project/itinerary/ItineraryCalculator.java
index 5391c19..fcce253 100644
--- a/src/main/java/fr/u_paris/gla/project/itinerary/ItineraryCalculator.java
+++ b/src/main/java/fr/u_paris/gla/project/itinerary/ItineraryCalculator.java
@@ -94,7 +94,8 @@ public class ItineraryCalculator {
         Stop toStop = getOrCreateStop(nodes, tmp, line[IDFM_TRACE_TO_INDEX], line[IDFM_TRACE_TO_GPS_INDEX], line[IDFM_TRACE_ID_INDEX]);
 
         String[] timeString = line[IDFM_TRACE_TIME_INDEX].split(":");
-        int time = Integer.parseInt(timeString[0]) * 60 + Integer.parseInt(timeString[1]);
+        String time0WithoutComma = timeString[0].replace(",", "");
+        int time = Integer.parseInt(time0WithoutComma) * 60 + Integer.parseInt(timeString[1]);
 
         Connection connection = new Connection(toStop, line[IDFM_TRACE_ID_INDEX], Double.parseDouble(line[IDFM_TRACE_DISTANCE_INDEX]), time);
 
@@ -106,6 +107,7 @@ public class ItineraryCalculator {
             LOGGER.severe("Invalid command line. Target file names are in the main file for now.");
             return;
         }
+        IDFMNetworkExtractor.builFiles();
 
         try {
             HashSet<Stop> nodes = new HashSet<>();