We would like to inform you that the contractor has issued a construction report (No. 16, June 2026) regarding the "Shin-Iriyama Tunnel Construction" project on National Route 158, Nagawado Improvement.
There are no traffic restrictions due to construction this month (June 2026).
Currently, excavation work and soil transportation are underway at the end of the Shin-Iriyama Tunnel. There will be no road closures or lane restrictions as a result of these operations.
Please see the attached PDF for details.
【inquiry】
Contractor: Zenitaka Corporation, Nagawado Improvement Tunnel No. 1 Construction Site (TEL 0263-87-8155)
Client: Nagano National Highway Office, Matsumoto National Highway Branch Office, Ministry of Land, Infrastructure, Transport and Tourism (TEL 0263-25-5752)
