Overview

• Expressway operators project 479 traffic jams over 10 km during the August 7–17 Obon period, about 15 percent more than last year.
• They expect 23 instances of congestion exceeding 30 km, roughly matching 2024’s levels.
• Outbound traffic is forecast to peak on August 9–10, while return flows will hit their worst on August 11, 15 and 16.
• The longest jams are predicted at up to 45 km near Sagamiko IC on the Chuo Expressway outbound and up to 40 km near Sakado-nishi Smart IC inbound.
• Operators advise staggered travel times, discourage unnecessary lane changes and direct motorists to online detour guidance.