Drivers often follow sat-nav instructions without question, assuming they offer the quickest route to their destination.
But motorists were left baffled after Google Maps directed them off the A9 and onto a single-track road after incorrectly suggesting the main route was closed.
The app was sending drivers away from the major trunk road and onto an unclassified route, which quickly became overwhelmed by traffic.
The diversion caused chaos in the Perthshire villages of Ballinluig, Tulliemet and Guay as vehicles came to a standstill on the unclassified 163 road.
The issue prompted Traffic Scotland to urge drivers to ignore their sat-navs and remain on the
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