An incident occurred on 14 November 2018, when the Japan Ground Self-Defense Force was conducting a military exercise in Takashima, Shiga near Route 303.

During the exercise, the JGSDF unintentionally hit the road with a live 81 mm mortar round.

The resultant explosion caused fragments of pavement go flying, some of which struck a parked car with an elderly man inside.

The man was not injured, but the car was damaged, with dents and some shattered windows.

[2] This article relating to the roads and highways in Japan is a stub.