Chaos ensued on German roads this week after Google Maps wrongly informed drivers that highways throughout the country were closed during a busy holiday. Many of the apparently closed roads were located near large German cities and metropolitan areas, including Berlin, Düsseldorf and Dortmund.

As reported by a locally based journalist for , drivers opening Google’s navigation app would see a swarm of red dots used to indicate no-go areas, which resulted in people looking for alternative routes that caused traffic pile-ups nationwide. The Guardian also reported that police and local authorities were contacted by people confused (and presumably pretty annoyed) about the supposed standstill.

To compound the issue, the Google Maps error coincided with the beginning of Germany’s Ascension Day public holiday on May 29, which meant the roads were even busier than usual.

The problem reportedly only lasted for a few hours and by Thursday afternoon only genuine road closures were being displayed. It’s not clear whether Google Maps had just malfunctioned, or if something more nefarious was to blame. “The information in Google Maps comes from a variety of sources. Information such as locations, street names, boundaries, traffic data, and road networks comes from a combination of third-party providers, public sources, and user input,” a spokesperson for Google told German newspaper , adding that it is internally reviewing the problem. “In general, these sources provide a strong foundation for comprehensive and up-to-date maps.”

Technical issues with Google Maps are not uncommon. Back in March, that their Timeline — which keeps track of all the places you’ve visited before for future reference — had been wiped, with Google later confirming that some people had indeed had their data deleted, and in some cases, would not be able to recover it.