The latest regulatory information isDraTraPlease see.

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NEXCO EAST Kazo Management Office (Kazo City, Saitama Prefecture), Chiba Management Office (Chiba City, Chiba Prefecture), Yawara Management Office (Tsukubamirai City, Ibaraki Prefecture), and Tsukuba Construction Office (Tsukuba City, Ibaraki Prefecture) will be carrying out repairs to the road surface and repairs and inspections of road structures on the C4 Ken-o Expressway (hereinafter referred to as the "Ken Ken-O Road") between the Bando Interchange (hereinafter referred to as the "IC") and Taiei Junction (hereinafter referred to as the "JCT"), as well as implementing night-time road closures to carry out construction work related to the widening to four lanes.
We apologize for any inconvenience this may cause, and we ask for your understanding and cooperation in allowing yourself plenty of time when heading out.

1. Closed section and date and time

1. Closed section
   Ken-O Road and Outer Loop Bando IC to Daiei JCT
   Section Ⅰ①:

   Bando IC to Amihigashi IC

   Section Ⅰ②:

   Joso IC to Amihigashi IC

   Section II:

   Ami East IC-Daiei JCT



2. Date and time

2. Detour

When taking detours, please refer to the attached sheet below for the road closure sections of Section I①　, Section I②,　and Section II.

Detours will increase the time required, so please take time to go out.

3. Regarding transit adjustments due to suspension of traffic

For customers who exit Expressway due to a road closure, detour around the closed section, and then re-enter to continue their journey in the same direction, we will implement a "transfer adjustment" to adjust the toll based on the section of the expressway used.
(See Attachment-2 (I-II) [PDF: 724KB])

Transfer IC

​Section I①: Bandō IC to Amihigashi IC
*June 8th (Monday) to 10th (Wednesday)

1. Bandō IC and Inashiki-Higashi IC are ETC-only toll gates, but they can also be used by vehicles other than ETC vehicles as designated exit and re-entry interchanges during road closures. If you are using a vehicle other than an ETC vehicle at Bandō IC or Inashiki-Higashi IC, please use the lane marked "Support," come to a complete stop, and follow the instructions of the on-site staff and guides.

​Section I②: Joso IC to Ami-Higashi IC
*June 11th (Thu) - 12th (Fri)

1. Bandō IC and Inashiki-Higashi IC are ETC-only toll gates, but they can also be used by vehicles other than ETC vehicles as designated exit and re-entry interchanges during road closures. If you are using a vehicle other than an ETC vehicle at Bandō IC or Inashiki-Higashi IC, please use the lane marked "Support," come to a complete stop, and follow the instructions of the on-site staff and guides.

​Section II: Ami-Higashi IC to Daiei JCT
*June 22nd (Mon) - 26th (Fri)

1. Ushiku-Ami IC and Sawara-Katori IC are ETC-only toll gates, but they can also be used by vehicles other than ETC vehicles as designated exit and re-entry interchanges during road closures. If you are using a vehicle other than an ETC vehicle at Ushiku-Ami IC or Sawara-Katori IC, please use the lane marked "Support," come to a complete stop, and follow the instructions of the on-site staff and guides.

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.

Four. Overview of construction etc.

In addition to repairing the pavement and inspecting road structures, construction work will be carried out on the inner and outer loop of Ken-O Road between the Bando IC and the Daiei JCT, in addition to construction work to widen the road to four lanes. In order to minimize inconvenience to customers, the road will be closed at night on weekdays when traffic volume is low, and construction work will be carried out in a concentrated and efficient manner. We ask for your understanding and cooperation so that you can use Expressway safely and comfortably.

Five. How to obtain traffic information

(1) Guidance by distribution / posting

• Notice signs, posters and leaflets will be posted at toll booths and rest facilities nearby.
• A banner will be posted on the overpass on the Expressway.

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

• NEXCO東日本お客さまセンター（24時間オペレーターが対応）
  ナビダイヤル：0570-024-024
  または：03-5308-2424
• NEXCO EAST Expressway Traffic Information Site "DraTra"
  Real-time information

  https://www.drivetraffic.jp/

  Construction regulation information

  https://www.drivetraffic.jp/construction-regulation
• 日本道路交通情報センター（JARTIC）道路交通情報
  全国共通ダイヤル　050-3369-6666
  （携帯電話短縮ダイヤル　#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
  埼玉情報　050-3369-6611
  茨城情報　050-3369-6608
  千葉情報　050-3369-6612
  ホームページ　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.
• VICS
  You can get road traffic information with VICS-compatible car navigation and other on-board devices.

• Information is also distributed through official accounts on X (formerly Twitter) and LINE.
  [X (old Twitter)]
  "NEXCO EAST (Kanto)" (@e_nexco_kanto) Expressway information
  "NEXCO EAST (Kanto Construction Regulations)" (@e_nexco_kanto_k) Decision on implementation of construction restrictions
  [LINE]
  "NEXCO EAST" (@e-nexco) Road closures and weather information

Attachment material

• Attachment-3① Construction Steps Until Completion of the 4-Lane Expansion Project Between Joso IC and Tsukuba Chuo IC [PDF: 206KB]
• Attachment-3②: Construction Steps for Switching Ramp and Lane Operations Between Ushiku-Ami IC and Ami-Higashi IC [PDF: 404KB]