diff --git a/frontend/src/spatialData.js b/frontend/src/spatialData.js
index b874547..93d1650 100644
--- a/frontend/src/spatialData.js
+++ b/frontend/src/spatialData.js
@@ -7,13 +7,12 @@ import { TravelTimeQuery } from './travelTimeQuery.js'
 import { domain } from './domain.js'
 import PQueue from 'p-queue'
 
-const queue = new PQueue({concurrency: 3})
-
 // instantiated once, this is the data store for all spatial and temporal data
 export class SpatialData {
     #factors = []
     #queries = new Map() // store/cache for travelTimeQueries, letting them remember their results if any
     #knownHolidays = []
+    #queue = new PQueue({concurrency: 3})
     constructor(){
         this.#factors.push(new Days(this))
         this.#factors.push(new HolidayOption(this,true))
@@ -119,7 +118,7 @@ export class SpatialData {
         return [...this.#queries.values()].sort((a,b)=> a.URI < b.URI ? -1 : 1)
     }
     fetchAllResults(){
-        return queue.addAll(
+        return this.#queue.addAll(
             this.travelTimeQueries
                 .filter( TTQ => ! TTQ.hasData )
                 .map( TTQ => () => TTQ.fetchData() )