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Construction of 4 lanes for Joshin-Etsu Expressway (between Toyota Iiyama IC and Shinanomachi IC) is completed

～Joshinetsu road can be run more safely and comfortably～

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  • Construction of 4 lanes for Joshin-Etsu Expressway (between Toyota Iiyama IC and Shinanomachi IC) is completed
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October 13, 2009
East Nippon Expressway Co., Ltd.

NEXCO EAST (Chiyoda-ku, Tokyo, Chairman: Shigejiro Yagi) is constructing a four-lane construction between the Joshin-Etsu Expressway Toyota Iiyama Interchange (IC) and Shinanomachi IC (8.6km). It will be completed on Thursday, November 19, 2009.

With this four-lane system, it is possible to drive at 80km/h (regulated speed), and it is possible to eliminate the traffic congestion caused by the concentration of traffic during the tourist season, etc., and to drive more safely and comfortably. I can.

Overview of 4-lane completed section

  • Joshinetsu Expressway (between Toyota Iiyama IC and Shinanomachi IC) Extension: 8.6km
  • Construction section
    From Nagae, Nakano City, Nagano Prefecture
    Nagano Prefecture Kamimizuuchi-gun Shinano-machi Ooaza Tomino
  • Location map

Image of position map

Joshin-Etsu Expressway Toyota Iiyama IC-Shinanomachi IC 4 lanes

1.4 Lane construction overview

Joshin-Etsu Expressway branches west from Kan-Etsu Expressway Fujioka JCT (Fujioka City, Gunma Prefecture) to Nagano Expressway at the Keihan JCT (Chikuma City, Nagano Prefecture) and Joetsu JCT (Joetsu City, Niigata Prefecture). It is Expressway with an extension of about 203km that connects to Hokuriku Expressway.

The entire line has been opened due to the opening of the Nakago IC to Joetsu JCT in October 1999. By forming a wide area network with the Kan-Etsu Expressway, Chuo Expressway, Nagano Expressway and Hokuriku Expressway it is possible to run along the Joshinetsu region. This route plays an important role in contributing to the development of the local economy, industry, and culture.

Regarding the 4-lane project, after the opening of the provisional 2-lane, it played a role as an artery connecting Nagano prefecture and Niigata prefecture, greatly contributing to logistics and tourism, and since the traffic volume showed steady growth, In December 1998, we received an enforcement order between Shinshu Nakano IC and Shinanomachi IC. Then, we started construction of four lanes between Shinshu Nakano IC and Toyota Iiyama IC, and completed the four lanes on the same section on April 29, 2005.

The remaining 4 lanes (8.6km) between Toyota Iiyama IC and Shinanomachi IC will be completed this time.

Image of position map (details)

2. Effect of completion

This completion will eliminate the accident of jumping into an oncoming lane, improving safety and enabling smooth and comfortable driving as described below.

(1) Relieving congestion during the busy season
The average annual traffic volume between Toyota Iiyama IC and Shinanomachi IC is approximately 11,000 vehicles/day (*1), and traffic congestion causes congestion during traffic congestion (Golden Week, Obon, New Year's holidays). This completion will eliminate traffic congestion caused by traffic congestion in the section concerned.

  • 1 Average daily traffic in 2008 (January to December)

(2) Elimination of traffic closure due to night construction
The section was closed at night in order to carry out the necessary repair work in order to maintain and manage the road in early September every year.However, because of the four lanes, repair work by lane regulation will be possible, There will be no night traffic.

(3) Improving regulatory speed and ensuring punctuality
With four lanes, the regulation speed will be changed from 70km/h to 80km/h. In addition, overtaking is also possible, which is expected to contribute to ensuring punctuality.

Image image of traffic volume (Toyota Iiyama-Shinanomachi), annual average daily traffic volume and number of traffic jams (Toyota Iiyama-Shinanomachi)

  • Traffic volume is a preliminary value based on cross-sectional traffic volume (traffic counter [automatic measuring device for traffic volume (approximate number) installed on the road]) for all vehicle types including ETC vehicles
  • The number of traffic congestion counts for traffic congestion with a traffic congestion length of 1 km or more.