The latest regulatory information isDraTraPlease see.

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NEXCO EAST Tsukuba Construction Office (Tsukuba City, Ibaraki Prefecture) will be closing the entrance ramp of the Ushiku-Ami Interchange (hereinafter referred to as "IC") on the C4 Ken-o Expressway Ken-O Road hereinafter referred to as "Ken-O Expressway") for continuous day and night operations to carry out IC reconstruction work related to widening the expressway to four lanes. In addition, nighttime road closures will be implemented between Tsukuba-Ushiku IC and Ami-Higashi IC for paving work related to widening the expressway to four lanes.
We sincerely apologize for any inconvenience this may cause, but we ask for your understanding and cooperation in allowing extra time when you go out.

1. Closed section and date and time

1. Lamp closure locations:
   Section 1:

   Ken-O Road Outer Loop, Ushiku-Ami IC Entrance Ramp (towards Narita)
2. Closed section:
   Section 2:

   Tsukuba Ushiku IC to Ami Higashi IC (inbound and outbound)



3. Date and time

2. Detour

　迂回にあたっては、区間①別紙-1-1【PDF：279KB】および区間②別紙-1-2【PDF：299KB】をご参照ください。
　迂回により所要時間が長くなりますので、お時間にゆとりをもってお出かけください。

3. Regarding transit adjustments due to suspension of traffic

　通行止めにより高速道路を一旦流出し、通行止め区間を迂回して、再流入して順方向に乗り継がれるお客さまには、ご利用区間に応じて通行料金を調整する「乗継調整」を実施します。（別紙-2【PDF：206KB】参照）

Transfer IC

Section ②: Tsukuba Ushiku IC to Ami Higashi IC

1. Inashiki-Higashi Interchange is an ETC-only toll gate, but it can also be used by vehicles other than ETC vehicles as a designated exit and re-entry interchange during road closures. If you are using Inashiki-Higashi Interchange in a vehicle other than an ETC vehicle, please use the lane marked "Support," come to a complete stop, and follow the instructions of the on-site staff and on-site 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. Construction overview

On Ken-O Road-Ushiku IC and Ami-Higashi IC in conjunction with the expansion to four lanes. As a result, the entrance ramp to Ushiku-Ami IC (towards Narita) on the outbound side of Ken-O Road will be closed day and night, and the section between Tsukuba-Ushiku IC and Ami-Higashi IC will be closed at night. We ask for your understanding and cooperation to ensure safe and comfortable use of Expressway.

• つくば牛久IC～阿見東IC間については、4車線化に伴う工事により車線運用切替が生じます。
  詳細は別紙-3【PDF：183KB】をご確認いただきますようお願いします。

Five. How to obtain traffic information

(1) Guidance by distribution / posting

• Posters and leaflets will be displayed at nearby toll gates and rest facilities.
• 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
  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