diff --git a/src/repositories/InMemoryNotificationRepository.ts b/src/repositories/InMemoryNotificationRepository.ts
index db6e9bc..ecd3e7b 100644
--- a/src/repositories/InMemoryNotificationRepository.ts
+++ b/src/repositories/InMemoryNotificationRepository.ts
@@ -42,6 +42,10 @@ export class InMemoryNotificationRepository implements NotificationRepository {
     return this.deviceIdsToDeliverTo[tuple.toString()][deviceId];
   }
 
+  async isNotificationScheduled(lookupArguments: NotificationLookupArguments): Promise<boolean> {
+    return await this.getSecondsThresholdForNotificationIfExists(lookupArguments) !== null;
+  }
+
   async addOrUpdateNotification({
     shuttleId,
     stopId,
@@ -71,4 +75,5 @@ export class InMemoryNotificationRepository implements NotificationRepository {
 
     delete this.deviceIdsToDeliverTo[tupleKey.toString()][deviceId];
   }
+
 }
diff --git a/src/repositories/NotificationRepository.ts b/src/repositories/NotificationRepository.ts
index 343497e..6914bf8 100644
--- a/src/repositories/NotificationRepository.ts
+++ b/src/repositories/NotificationRepository.ts
@@ -17,6 +17,7 @@ export interface ScheduledNotification extends NotificationLookupArguments {
 export interface NotificationRepository {
   getAllNotificationsForShuttleAndStopId(shuttleId: string, stopId: string): Promise<ScheduledNotification[]>;
   getSecondsThresholdForNotificationIfExists(lookupArguments: NotificationLookupArguments): Promise<number | null>;
+  isNotificationScheduled(lookupArguments: NotificationLookupArguments): Promise<boolean>;
   addOrUpdateNotification(notification: ScheduledNotification): Promise<void>;
   deleteNotificationIfExists(lookupArguments: NotificationLookupArguments): Promise<void>;
 }