Some satellite navigation systems have been sending bus drivers the wrong way around the Ring of Kerry.
Since the 1800s all large vehicles have gone anti-clockwise on the route.
However, GPS devices are now sending buses and trucks the wrong way around the 180km ring.
Drivers of large vehicles are also getting stuck in tunnels and bridges on stretches of the narrow winding road.
Councillor Tom Doherty from Killarney Town Council has said the systems need to be updated.