For example, when you travel from Nagoya Station to Shizuoka Station (on the Shinkansen line) and to Yaizu Station, you cannot buy a one-way regular ticket for Nagoya to Yaizu because the section between the Shizuoka Station and the Yaizu Stations double, and you have to buy a ticket between Nagoya and Shizuoka and another one between Shizuoka and Yaizu (it is possible to buy a regular train ticket for a connected train ride).
例として名古屋駅→（新幹線）→静岡駅→焼津駅と乗車する場合、静岡-焼津間が重複となるため1枚の片道乗車券にはできず、名古屋→静岡と静岡→焼津の別々の乗車券が必要である（普通乗車券連続乗車券にする事もできる）。