[E18] Joshin-Etsu Expressway In-bound) between Saku IC and Usui Karuizawa IC
Notice of nighttime road closure due to tunnel renewal work

The latest regulatory information is​ ​DraTra​ ​Please see.

PDF version [PDF: 728KB]

　NEXCO東日本　長野工事事務所（長野県長野市）では、E18上信越自動車道（以下「上信越道」）佐久（さく）インターチェンジ（以下「IC」）から碓氷軽井沢（うすいかるいざわ）IC間の上り線において、老朽化した閼伽流山（あかるさん）トンネルのリニューアル工事に伴う通行止めを実施します。お客さまにはご迷惑をおかけしますが、安全・快適に高速道路をご利用いただくために必要な工事ですので、工事へのご理解とご協力をお願いします。

1. Overview of road closures

Construction image photo (past construction)

2. Construction section Joshinetsu Expressway In-bound) Saku IC ⇒ Usui Karuizawa IC

• 通行止めに伴う迂回路については別紙-1【PDF：194KB】をご確認ください。

3. Regarding transit adjustments due to suspension of traffic

For customers who temporarily flow out of Expressway due to road closures, detour around the road closure section, re-enter and transfer in the forward direction, we will implement "connection adjustment" to adjust the toll according to the section used. Masu.
(Refer to Attachment-2 [PDF: 167KB])

Transfer designated IC

• The Chubu-Tokaidō Expressway is a toll-free section, so there are no toll booths at any ICs.
  Customers paying by cash or other means should receive a "Transfer Certificate" at the Komoro Mikage toll gate.

How to use transit adjustment

ETC customers

• For customers using ETC, please drive wirelessly at designated outflow ICs, and also wirelessly drive at re-inflow ICs. (Transfer certificates are not issued for ETC vehicles)
• ETC time zone discount will be applied, considering the transited journey as one.
  Toll charges are adjusted at the time of billing, so they may differ from those displayed at the toll gate.
• Insert the same ETC card for all journeys and pass through the ETC lane at the tollgate.

Customers such as cash

• Customers paying with cash, etc. should receive a "transfer certificate" at the outflow designated IC, then take a "transit ticket" at the re-inflow IC, and then take the "transition certificate" at the toll booth where they pay the toll for the first time. Please hand over your ``book'' and ``traffic ticket.''

Common to ETC and cash customers

• If the suspension of traffic is released after the outflow designated IC is released, the fare will be adjusted even if it is re-introduced from the IC (including the outflow designated IC) in the closed road section in the forward direction.

4. Overview of tunnel reinforcement work

At the Ding-Ryuyama Tunnel, which is located between the Saku IC ⇒ the Usui Karuizawa IC on the Joshinetsu Expressway In-bound Line, we will carry out tunnel reinforcement work to prevent bumps and damage to the road surface due to the expansion of the ground around the tunnel. Among them, on May 27 (Tuesday) and June 17 (Tuesday) in Reiwa 7, the road will be closed at night to assemble and dismantle the excavation machinery for the installation of inverts. Since these works cannot be carried out under normal lane restrictions, the road will be closed on weekday evenings when traffic is low. This is necessary for the safe and comfortable use of Expressway, so we ask for your understanding and cooperation.

Main work contents

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 joined to the inverted arch by concrete, which increases bearing strength and prevents subsidence and deformation.

Five. Request when using

1. During the construction period, please check the latest traffic information on the websites listed in "6. How to get traffic information" before heading out. Also, please allow yourself plenty of time when traveling.
2. During the construction period, we will be displaying LED information boards, providing information on construction restrictions, and calling for caution so that people can drive safely. Please be sure to check this information before driving.

6. How to obtain traffic information

(1) Guidance by distribution / posting

• 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.

(2) Road traffic information that can be obtained before going out

• Expressway renewal project website
• NEXCO EAST Road Traffic Information Site "DraTra"
  Real-time information

  [PC] https://www.drivetraffic.jp/

  [Mobile] http://m.drivetraffic.jp/

  Construction regulation information

  [PC] https://www.drivetraffic.jp/construction-regulation
• NEXCO東日本お客さまセンター
  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
  長野情報　050-3369-6620
  【PC】https://www.jartic.or.jp/

(3) Road traffic information available 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.

• Information is also distributed through official accounts on X (formerly Twitter) and LINE.
  [X (formerly Twitter)]
  "NEXCO EAST (Kanto)" (@e_nexco_kanto) Real-time traffic information
  "NEXCO EAST (Kanto Construction Restrictions) (@e_nexco_kanto_k) Implementation decision of construction restrictions
  [LINE]
  "NEXCO EAST" (@e-nexco) Road closures and weather information