You can use ETC at the Yamada toll gate on the Ibusuki Skyline. This service started on the 1st of this month. There is only 1 ETC lane at the moment, but there will be 2 lanes in March next year.
The fee through the ETC lane is a little bit cheaper. It costs 290 yen for standard-sized cars, 180 yen for k-cars.
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