▁Ky ū sh ū ▁and ▁Sh ik oku . ▁The ▁ ▁highway ▁origin ates ▁at ▁a ▁j unction ▁with ▁Rout es ▁ 1 0 ▁and ▁ 2 1 0 ▁in ▁ Ō ita , ▁ Ō ita ▁and ▁termin ates ▁at ▁a ▁j unction ▁with ▁Route ▁ 5 6 ▁in ▁Sus aki , ▁K ō chi . ▁The ▁route ▁is ▁interrupted ▁between ▁S agan ose ki ▁area ▁of ▁ Ō ita , ▁ Ō ita ▁( where ▁it ▁joins ▁with ▁Route ▁ 2 1 7 ) ▁and ▁I k ata , ▁E h ime ▁because ▁of ▁the ▁H ō yo ▁Stra it , ▁and ▁traffic ▁between ▁the ▁two ▁islands ▁is ▁carried ▁by ▁a ▁fer ry ▁between ▁the ▁two ▁towns . ▁Though ▁the ▁gap ▁is ▁less ▁than ▁ 1 5   km ▁at ▁the ▁stra it ' s ▁narrow est ▁point , ▁there ▁are ▁currently ▁no ▁plans ▁to ▁bridge ▁the ▁gap . ▁ ▁History ▁Route ▁ 1 9 7 ▁was ▁originally ▁designated ▁on ▁ 1 8 ▁May ▁ 1 9 5 3 ▁from ▁M ats uy ama ▁to ▁K ō chi . ▁This ▁was ▁red es ign ated ▁as ▁Route ▁ 5 6 ▁on ▁ 1 ▁April ▁ 1 9 6 3 . ▁ ▁Route ▁description ▁The ▁road ▁is ▁affection ately ▁nick named ▁" M el ody ▁Line ". ▁As ▁a ▁result , ▁it ▁gained ▁two ▁musical ▁road ▁segments ▁located ▁in ▁I k ata , ▁the ▁first ▁of ▁which ▁was ▁placed ▁on ▁the ▁road ▁to ▁celebr ate ▁its ▁anni versary ▁of ▁being ▁built ▁in