diff --git a/backend/src/data/mocks/notification-types.mock.ts b/backend/src/data/mocks/notification-types.mock.ts
index 3d752ce..fb9e19e 100644
--- a/backend/src/data/mocks/notification-types.mock.ts
+++ b/backend/src/data/mocks/notification-types.mock.ts
@@ -3,6 +3,7 @@
 export const NotificationType = {
   ROUTE_START: "ROUTE_START",
   TRUCK_PROXIMITY: "TRUCK_PROXIMITY",
+  TRUCK_ARRIVED: "TRUCK_ARRIVED",
   ROUTE_COMPLETED: "ROUTE_COMPLETED",
   DELAY: "DELAY",
   MECHANICAL_FAILURE: "MECHANICAL_FAILURE",
@@ -25,6 +26,10 @@ export const notificationPayloads: Record<NotificationType, NotificationPayload>
     title: "Camión Cercano",
     body: "El camión está a menos de 15 minutos de tu domicilio. Es momento de sacar tus bolsas a la acera.",
   },
+  TRUCK_ARRIVED: {
+    title: "¡El camión ya está aquí!",
+    body: "El camión recolector llegó a tu zona. Saca tus residuos a la acera ahora.",
+  },
   ROUTE_COMPLETED: {
     title: "Servicio Finalizado",
     body: "El camión de tu sector ha concluido su jornada de recolección diaria.",
@@ -43,5 +48,6 @@ export const notificationPayloads: Record<NotificationType, NotificationPayload>
 export const positionTriggers: Record<number, NotificationType> = {
   2: NotificationType.ROUTE_START,
   4: NotificationType.TRUCK_PROXIMITY,
+  5: NotificationType.TRUCK_ARRIVED,
   8: NotificationType.ROUTE_COMPLETED,
-};
\ No newline at end of file
+};
diff --git a/backend/src/domain/use-cases/notifications/calculate-eta.use-case.ts b/backend/src/domain/use-cases/notifications/calculate-eta.use-case.ts
index 31083da..090afc5 100644
--- a/backend/src/domain/use-cases/notifications/calculate-eta.use-case.ts
+++ b/backend/src/domain/use-cases/notifications/calculate-eta.use-case.ts
@@ -8,7 +8,9 @@ export interface EtaResult {
   message: string;
 }
 
-const PROXIMITY_POSITION_ID = 4;
+// El destino real (cuando el camión está en tu colonia) es positionId=5,
+// donde speed=0. positionId=4 es el "punto de alerta de proximidad" (~12 min antes).
+const ARRIVAL_POSITION_ID = 5;
 const WINDOW_MARGIN_MIN = 5;
 
 export class CalculateEtaUseCase {
@@ -28,11 +30,11 @@ export class CalculateEtaUseCase {
     }
 
     const target = route.positions.find(
-      (p) => p.positionId === PROXIMITY_POSITION_ID,
+      (p) => p.positionId === ARRIVAL_POSITION_ID,
     );
     if (!target) {
       throw CustomError.internalServer(
-        `Route ${route.routeId} has no proximity position`,
+        `Route ${route.routeId} has no arrival position`,
       );
     }
 
@@ -50,6 +52,8 @@ export class CalculateEtaUseCase {
     let message: string;
     if (etaMinutes < 0) {
       message = `El camión ya pasó por tu zona (aprox. ${arrivalWindow.from} - ${arrivalWindow.to}).`;
+    } else if (etaMinutes === 0) {
+      message = "El camión ya está en tu zona. Saca tus residuos ahora.";
     } else if (etaMinutes <= 15) {
       message = `Llega en aproximadamente ${etaMinutes} minutos.`;
     } else {