[E18] Joshin-Etsu Expressway In-bound line Saku IC ⇒ Usui Karuizawa IC
[E19] Nagano Expressway Out-bound Line Azumino IC ⇒ Koshoku IC
Nighttime traffic closure due to tunnel renewal construction
Notice of change in construction period

The latest regulatory information isDraTraPlease see.

PDF version [PDF: 503KB]

At NEXCO EAST Nagano Construction Office (Nagano City, Nagano Prefecture), the E18 Joshin-Etsu Expressway and E19 Nagano Expressway are closed at night due to the renovation work of the aging tunnel.
The road closure period was originally set for July 20 (Thursday) and July 31 (Monday), 2023, but due to construction delays, the road closure period will be changed.

[Changes]
initially

Change

Renewal work is necessary for the safe and secure use of Expressway. We will do our best to minimize the inconvenience to our customers, so we ask for your understanding and cooperation.

Construction image photograph

1. Construction overview

In the following tunnels, tunnel reinforcement work will be carried out to prevent road surface upheaval and damage due to expansion of the ground.

• Joshinetsu Expressway In-bound Line Akarusan Tunnel
  Joshinetsu Expressway In-bound line Saku IC ⇒ At the Yato Nagareyama tunnel located at Usui Karuizawa IC, on July 4, 5th year of Reiwa, to switch the central drainage pipe in the tunnel, August 28th and September 11th, 2023 will be closed at night to assemble and dismantle construction machinery necessary for tunnel reinforcement work.
• Nagano Expressway Out-bound Line Ipponmatsu Tunnel
  At the Ipponmatsu Tunnel, which is located between the Asagi IC and Koshoku IC on the Nagano Out-bound Line, we will remove the protective fence that was installed for the tunnel reinforcement work.

Since these construction works cannot be carried out under normal lane restrictions, the construction work will be carried out after closing the road at night on weekdays when there is little traffic.

[Main contents of tunnel reinforcement work]

In order to create a stronger ring-shaped structure for tunnels that are subject to excessive force from around the tunnel, inverts are installed to improve stability. Specifically, concrete (invert) will be installed to reinforce the bottom of the tunnel after excavating the road surface, and then paving work will be carried out to restore the road to a drivable one.

• What is an invert?--The bottom of the tunnel is connected to the inverted arch with concrete, increasing the yield strength and preventing subsidence and deformation.

In order to minimize the inconvenience to customers, we will close the road at night on weekdays when the traffic volume is low, and carry out the construction work intensively and efficiently. We ask for your understanding and cooperation as this work is necessary for safe and comfortable use of Expressway.

2. How to obtain traffic information

(1) Road traffic information available before going out

• Dedicated website for Expressway renewal project
• NEXCO EAST website "Construction regulation information"
  (providing information on construction regulations in each region)
  Please select "Construction regulation information" from the "Expressway users" tag.
• NEXCO EAST road traffic information site "DraTra "
  (Provides traffic information on Expressway nationwide)
  [PC] https://www.drivetraffic.jp/
  [Mobile] http://m.drivetraffic.jp/
• NEXCO東日本お客さまセンター
  （24時間、365日、お客さまの声をお聞きしています）
  ナビダイヤル　0570-024-024（24時間オペレーターが対応）
  または　03-5308-2424
• 日本道路交通情報センター（JARTIC）の道路交通情報
  全国共通ダイヤル　050-3369-6666
  （携帯短縮ダイヤル　#8011）
  ※全国どこからでも最寄りの情報センターに接続します。
  全国・関東甲信越情報　050-3369-6600
  群馬情報　050-3369-6610
  長野情報　050-3369-6620
  【PC】https://www.jartic.or.jp/

(2) Road traffic information that can be obtained while using the Expressway

• Road information board
• Highway radio (AM1620kHz)
  The highway radio section is indicated by signs on the Expressway.
• Highway Information Terminal
  Wide-area road information is provided in an easy-to-understand manner on the monitor screens installed in SA / PA.

(3) Information on distribution/postings

• Information on posters, leaflets and digital signage will be posted at nearby tollhouses, SA / PA.
• A banner will be posted on the overpass on the Expressway.

• Information is also distributed on the official accounts of Twitter and LINE.
  [Twitter]
  "NEXCO EAST (Kanto)" (@e_nexco_kanto) real-time traffic information
  "NEXCO EAST (Kanto Construction Regulations)" (@e_nexco_kanto_k) Decision to implement construction regulations
  [LINE]
  "NEXCO EAST" (@e-nexco) Road closures and weather information