Meanwhile, Lines Nos. 31A, 31B, and 32 on the route via Ogura were prohibited to operate large-size buses because of narrow road sections existing around Nishi-Imoarai.
尚小倉経由路線では31A/31B/32系統の運行区間の途中の西一口界隈に狭隘区間があり、同区間での大型車の入線は禁止されていた。