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[E18] Joshin-Etsu Expressway Outbound Matsuida Myogi Out-bound ⇒ Usui Karuizawa IC
Notice of day and night continuous lane restrictions due to tunnel renewal work [4th report]

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  • [E18] Joshin-Etsu Expressway Outbound Line Matsuida Myogi Out-bound ⇒ Usui Karuizawa IC Notification of day and night continuous lane restrictions due to tunnel renewal construction [4th report]
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The latest regulatory information isDraTraPlease see.

PDF version [PDF: 483KB]

Expressway renewal project logo image image 1

January 27, 5th year of Reiwa
East Nippon Expressway Co., Ltd.
Nagano construction office

NEXCO EAST At the Nagano Construction Office (Nagano City, Nagano Prefecture), E18 Joshin-Etsu Expressway (hereinafter referred to as "Joshinetsu Road"Out-bound Line Between the Matsuida Myogi Interchange (hereinafter referred to as "IC") and the Usui Karuizawa IC, we will restrict the continuous lane of day and night due to the renewal work of the aging Takaiwayama Tunnel. We apologize for any inconvenience this may cause, but we ask that you comply with the speed limit within the restricted area and cooperate in driving safely.
In addition, due to lane regulations, traffic congestion of up to 5 km is expected to occur during the daytime on weekdays. Customers who plan to use the applicable sectors are requested to change the usage time zone and allow plenty of time. This construction is necessary for the safe and comfortable use of the Expressway, so we ask for your understanding and cooperation in the construction.

1. 1. Overview of lane regulations

Route E18 Joshin-Etsu Expressway
section Matsuida Myogi IC ⇒ Usui Karuizawa IC Out-bound line
Implementation period

Day and night continuous lane regulation
Out-bound line (Matsuida Myogi IC ⇒ Usui Karuizawa IC)
Monday, February 27, 2023 to Friday, December 22, 2023 *Saturdays, Sundays, holidays, and some periods excluded
For details, please see "3. Lane restriction period and traffic congestion forecast"
Time zone 24 hours (all day)
Construction content Tunnel Reinforcement Work (See “5. Tunnel Reinforcement Work Outline”)

◆ Construction image photo (past construction)

Image of earth retaining pile driving
Soil pile driving situation
Image of completion of earth retaining pile driving
Completion of earth retaining pile placement
Image of invert drilling
Invert drilling situation
Image of completion of concrete placement
Concrete placement completed

2. Construction section

Joshinetsu Expressway Matsuida-Myogi IC ⇒ Usui-Karuizawa IC (Out-bound line)

Image image of construction section

3. About lane restriction period and traffic jam prediction

Lane regulation period February 27, 2023 (Monday) to December 22, 2023 (Friday) *Excluding Saturdays, Sundays, holidays, and some periods
Congestion forecast period As shown in the colored part of the table below

Lane regulation period Image image of the calendar for March 2020 during the traffic congestion prediction period
Lane restriction period Image image of the calendar for April 2020 during the traffic congestion prediction period
Lane regulation period Image image of the calendar for May 2020 during the traffic congestion prediction period
Lane regulation period Image image of the calendar for June 2020 during the traffic congestion prediction period
Lane regulation period Image image of the calendar for July 2020 during the traffic congestion prediction period
Legend image image
  • Except for some schedules, lane restrictions start at 6:00 am on Mondays and end at 6:00 pm on Thursdays or Fridays.
  • The regulation period may change depending on the weather and work progress.
  • We will inform you of the regulation schedule and traffic congestion forecast after August.
    In addition, construction will be canceled in August in consideration of summer vacation and Obon. Construction is scheduled to resume in late August.

Four. Traffic regulation contents

Day and night continuous lane regulation will be implemented. When driving, please follow the local signs and drive safely.
Lane restriction point: Outbound Out-bound (Matsuida Myogi IC ⇒ Usui Karuizawa IC)
Lane regulation extension: about 3.0km

Image image of driving lane regulation
Image image of passing lane regulation
  • Please be careful when merging because the lane restriction point and the uphill lane merge are close to each other.

Five. Overview of Tunnel Reinforcement Work

At the Takaiwayama Tunnel between Matsuida Myogi IC and Usui Karuizawa IC on the Joshinetsu Out-bound Outbound Line, tunnel reinforcement work will be carried out to prevent the road surface from swelling and damage due to expansion of the tunnel ground.

[Details of main construction]
In order to create a stronger ring-shaped structure for the tunnel, which is subject to excessive force from the ground, an invert is installed to improve stability. Specifically, concrete (invert) will be installed to reinforce the bottom of the tunnel after the excavation of the road surface, and then paving work will be carried out to restore the road to a drivable one. From March to December 2023, we will install foundation piles (earth retaining piles) for protective fences to ensure customer safety, excavate the ground, and install inverts.

Image image before construction
Image image after construction
  • 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.

6. Request when using

  1. Since the construction section will be subject to continuous day and night lane restrictions over a Out-bound line of approximately 3.0km, the number of lanes will be reduced from the current two lanes on each side to one lane. Since the lane width is narrow in the day and night continuous lane regulation section, please observe the regulated speed when driving, secure the inter-vehicle distance, and be careful about rear-end collisions. In addition, the lane position will change depending on the progress of construction, so please be careful when passing.
  2. Vehicles for construction work may enter and leave the area around the construction site, so please be careful when traveling ahead.
  3. Traffic congestion is expected to occur during the construction period due to traffic concentration. Before going out, please check the latest lane regulations and traffic information on the website described in "7. How to obtain traffic information". Also, when using it, please leave with plenty of time to spare.
  4. During the construction period, LED information boards and road signs will be used to provide information on lane restrictions and to call attention to ensure safe driving. Please check these information before driving and drive safely.

7. 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

(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 on the official Twitter account.
    "NEXCO EAST (Kanto)" (@e_nexco_kanto) Real-time traffic information
Expressway renewal project logo image image 2

Expressway renewal project
Now, safety and security are passed on to the next generation.
NEXCO EAST will work on the renewal and repair business of Expressway in order to deliver safety and security to everyone.
Or search for "high-speed renewal".

The NEXCO EAST Group has positioned the period from 2021 to 2025 as "a period that contributes to the achievement of the SDGs and transforms into a new future society," and is making various efforts.
We believe that this "renewal work" initiative will contribute to the SDGs goals No. 8, 9, and 11 as business activities that lead to the development of safe, secure, and reliable infrastructure.

Image image of the SUSTAINABLE DEVELOPMENT GOALS logo and the 8th, 9th, and 11th logos of the SDGs target
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