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NEXCO EAST Tsukuba Construction Office (Tsukuba City, Ibaraki Prefecture) will be implementing nighttime road closures between the Joso Interchange (hereinafter "IC") and Tsukuba-Chuo IC on the C4 Ken-o Expressway Expressway (hereinafter "Ken-O Ken-O Road") to carry out paving work to widen the road to four lanes. Additionally, the Tsukuba-Chuo IC exit ramp on the outer loop of Ken-O Road will be closed day and night to carry out IC reconstruction work to widen the road 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 going out.

1. Closed section and date and time

1. Closed section:
   区間①：

   Joso IC to Tsukuba Chuo IC (inner and outer loop)

   区間②：

   Tsukuba Chuo IC (Outer Loop) Exit



• Attached to each line C4 The indications such as indicate the route number (numbering) of Expressway.
2. Date and time

• Excluding weekends and holidays

2. Detour

For detours, please refer to Appendix 1 [PDF: 629KB].
The detour will increase travel time, so please allow yourself plenty of time when traveling.

3. Regarding transit adjustments due to suspension of traffic

For customers who exit Expressway due to a road closure, detour around the closed section, then re-enter and transfer in the same direction, we will implement a "transfer adjustment" in which the toll will be adjusted according to the section used. (See Appendix 2 [PDF: 393KB])

Transfer IC

Section 1: Joso IC to Tsukuba Chuo IC

• Joban Expressway ・ ・ ・ Joban Expressway

1. Bando IC and Ushiku Ami IC are ETC-only toll gates, but can also be used by non-ETC vehicles as designated exit and re-entry ICs when roads are closed. If you are using Bando IC or Ushiku Ami IC in a non-ETC vehicle, please use the lane marked "support," stop temporarily, and follow the instructions of local signs and staff.

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

Ken-O Road　Pavement work will be carried out between Joso IC and Tsukuba Chuo IC on the inner and outer boundary in conjunction with the 4-lane expansion. Also, Ken-O Road will close the Tsukuba Chuo IC exit ramp on the outer boundary for consecutive days and nights due to IC reconstruction work in conjunction with the four-lane expansion. In order to minimize inconvenience to our customers, we will close the ramp and close it on weekdays when traffic volume is low in order to implement the construction work intensively and efficiently. We ask for your understanding and cooperation in order to ensure the safe and comfortable use of Expressway.
For details, please refer to Appendix-3 [PDF: 238KB].​

Five. How to obtain traffic information

(1) Guidance by distribution / posting

• Posters and flyers will be posted at nearby toll booths and rest areas.
• 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

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

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

  Construction regulation information

  [PC] 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
  【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.
• VICS
  You can get road traffic information with VICS-compatible car navigation and other on-board devices.

• Information is also distributed on official X (formerly Twitter) and LINE accounts.
  [X (old Twitter)]
  "NEXCO EAST (Kanto)" (@e_nexco_kanto) Real-time traffic information
  “NEXCO EAST (Kanto Construction Regulations)” (@e_nexco_kanto_k) Decision to implement construction regulations
  [LINE]
  "NEXCO EAST" (@e-nexco) Road closures and weather information