When two people cross each other, they will know !

src/main/java/ch/hepia/config/AppConfig.java

@@ -25,6 +25,8 @@ public final class AppConfig {
 	public static final String ERROR_API_MQ = "Une erreur s'est produite lors de la publication de cet évènement.";
 	public static final String DEFAULT_JOURNEY_TEXT = "Vous n'avez prévu aucun voyage pour le moment.";
 
+	public static final String COMMON_ITINERARY_TEXT = "Vous allez croiser %s à %s ! Pensez à vous saluer !";
+
 	public static List<String> CHAT_COMMANDS = List.of(
         "help",
         "block",
@@ -46,6 +48,7 @@ public final class AppConfig {
 	public static final String WEATHER_ICON_SNOWY = "/img/snowy.png";
 	public static final String WEATHER_ICON_STORMY = "/img/stormy.png";
 	public static final String WEATHER_ICON_SUNNY = "/img/sunny.png";
+	public static final String JOURNEY_ICON_COMMON_ITINERARY = "/img/friends.png";
 
 	/**
 	 * Style

src/main/java/ch/hepia/ui/MainWindowController.java

@@ -410,6 +410,22 @@ public class MainWindowController implements Initializable {
                 drawMessage(message, AppConfig.CHAT_TRAIN_ICON_SELF, AppConfig.COLOR_BLUE_10_OPACITY);
             } else {
                 drawMessage(message, joinedJourney.getWeatherToDestination(), AppConfig.COLOR_BLUE_10_OPACITY);
+                try {
+                    Section commonSection = joinedJourney.getConnection().getInCommonSection(currentJourney);
+                    if (!(commonSection.equals(Section.empty()))){
+                        drawMessage(
+                                String.format(
+                                    AppConfig.COMMON_ITINERARY_TEXT,
+                                    sender.getName(),
+                                    commonSection.getDeparture().getLocation().getName()
+                                ),
+                            AppConfig.JOURNEY_ICON_COMMON_ITINERARY,
+                            AppConfig.COLOR_BLUE_50_OPACITY
+                        );
+                    }
+                } catch (ParseException e) {
+                    e.printStackTrace();
+                }
             }
         }), userFilter::test);