Fares for sections including the section between Iwakuni Station and Kushigahama Station on the Sanyo main line are calculated specially using the railway length of the Gantoku Line as the distance between the two stations (a special route section), and this special calculation is also applied to fares on the Sanyo Shinkansen line.
山陽本線には岩国駅-櫛ヶ浜駅間を含む区間について岩徳線経由のキロ数で運賃を計算する特例がある（経路特定区間）が、山陽新幹線にもこの特例が適用される。