However, due to the design of both the Seto-higashia and Oyamazaki junctions, which require ramps (in the highway lanes) to connect them to the Meishin Highway (in particular the very complicated design of the Oyamazaki junction), drivers have to reduce their speed.
しかし、瀬田東・大山崎両JCTが名神の後付けで設置された構造である（特に大山崎JCTの構造は極めて複雑なものになっている）が故にランプ(高速道路)部で減速運転となってしまう。