Nagano Expressway For falling sound insulation wall members from viaducts at Asa interchange and Sarah interchange.
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NEXCO EAST Kanto Regional Head Office (Saitama Prefecture) manages Nagano Expressway The sound insulation wall member installed on the viaduct at the Asami (Omi) interchange to the Koshoku interchange. Some have fallen.

There was no damage to third parties.

Immediately after the discovery, we performed an emergency inspection of the relevant part and completed safety confirmation.

We sincerely apologize for any inconvenience caused to our customers.

1 History of discovery

Monday, January 19, 2015 At around 8:00 am, nearby residents found a member of the sound insulation wall that had fallen to the side road and reported it to the police. The one that the police contacted us and confirmed the site.

2 Occurrence location

Nagano Expressway From the Omi interchange to the Koshoku interchange, on the side road parallel to the viaduct at 11.2km.
Between Omi Interchange and Koshoku Interchange, opened on March 25, 1993)
Place name: Kuwabara, Chikuma City, Nagano Prefecture

3 Falling sound insulation wall member

Dimensions 9 cm x 43 cm
Weight 740g
Material iron

4 Cause of fall

It is assumed that the cause is corrosion due to aging deterioration of the sound insulation wall.

5 Response status of the sound insulation wall

An emergency inspection was carried out yesterday due to the occurrence of an event, and safety confirmation has been completed.

Situation photo