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NEXCO EAST / NEXCO CENTRAL / NEXCO WEST / JB Honshi Expressway / The Japan Road Traffic Information Center (Public Interest Incorporated Foundation) announces forecasts for congestion due to concentrated traffic during the Obon period [August 7, 2026 (Fri) ~ August 16, 2026 (Sun), a ten-Expressway day period] (10 days of concentrated congestion over 10 km) ^(*).​
To ease congestion, please cooperate by changing your usage dates and time slots to spread out your usage.

1. 1. Congestion forecast

Number of traffic jams over 10km

　Total of 436 times for both inbound and outbound lines (August 7th to August 16th)

• This includes traffic congestion forecasts due to planned long-term construction restrictions. For details, please refer to "Attachment 3 [PDF: 420KB]".

Detailed traffic congestion forecasts, including those for congestion less than 30km in length, can be viewed on the following website.

Prediction of particularly long traffic jams for each company

PA: Parking area, IC: Interchange, TN: Tunnel, BS: Bus stop

• ○○ Road (△△ Road) means "a traffic jam that stretches from ○○ Road to △△ Road."
• For details on traffic jams exceeding 25km, please refer to Attachment 1 [PDF: 245KB], and for ways to avoid traffic jams, please refer to Attachment 2 [PDF: 1.3MB].

Please note that traffic congestion predictions are based on past traffic congestion records and recent traffic conditions, but may differ from actual traffic conditions due to traffic disturbances such as accidents, weather conditions, etc. Check the latest road traffic information before you depart and during your trip. Road traffic information can be found on the following website.

• NEXCO EAST
• NEXCO CENTRAL
• NEXCO WEST
• JB Honshi Expressway
• Japan Road Traffic Information Center

Comparison with last year (reference)

Due to reduced travel during last year's (2025) Obon period caused by severe weather, the number of traffic jams this year is expected to increase compared to last year. Please note that last year's figures include traffic jams caused by accidents and other incidents.

1. The number of traffic jams over 10km includes the number of traffic jams over 30km.
2. The forecast for 2026 is based on data collected over a 10-day period from August 7th (Friday) to August 16th (Sunday), 2026.
3. The data for 2025 is compiled from the 10-day period from August 8th (Friday) to August 17th (Sunday), 2025.

2. Key points for alleviating traffic congestion

1. Be careful of slowing down in areas where warnings are issued, such as when In-bound!
2. While driving, please avoid stepping on the brakes unnecessarily and maintain a sufficient following distance!
3. Please refrain from changing lanes recklessly during traffic congestion, as this may lead to further worsening of traffic congestion!

3． Please drive safely

Please cooperate by "wearing seat belts in all seats" and "taking frequent and early breaks." Also, please pay attention to what is ahead as you drive on Expressway and be aware of rear-end collisions at the end of traffic jams.

• https://www.c-nexco.co.jp/safety/safety_drive/

4. Eliminate wrong-way driving -Expressway are one-way streets -

Driving the wrong way is a dangerous act that can be life-threatening. U-turns and backing up are strictly prohibited. If you hear or see information about wrong-way driving, slow down, keep a sufficient distance, and keep a close eye on the movements of the vehicle ahead. For details, please see below.

• https://www.c-nexco.co.jp/safety/gyakusouboushi/

5. Holiday discounts will not be applied during the Obon period.

To avoid increased traffic congestion, holiday discounts will not be applied during this period. Please see below for details.

• https://www.c-nexco.co.jp/topics/2421.html

6. Information regarding Expressway Tour Passes

If you are using Expressway outside of the Obon period, please consider using the Expressway Tour Pass, which allows you to get on and off Expressway in eligible areas for a fixed price during the period of use.
In addition, we are currently running a campaign where if you use the service only on weekdays, you will receive additional ETC mileage service points worth 15% of the sales price.

• Expressway tour pass search site

(Sales exclusion period: Friday, August 7, 2020 to Sunday, August 16, 2020)