Dr. Heinz Doofenshmirtz is the antagonist of Perry the Platypus in Phineas and Ferb. He runs Doofenshmirtz Evil Incorporated, a company dedicated to destruction (with little profit on the side). At least two episodes of this series deal with toll roads:
According to the Wikia: In Toy to the World: "Not far from the toy factory, Perry arrives at Doofenshmirtz's location where a large amount of bricks are being loaded into truck. Perry gets caught in a brick trap and Doofenshmirtz approaches, explaining that he plans on constructing a great wall around the Tri-State Area. The only way people would be able to get in and out is through his toll booth."
In this case Doofenshmirtz is being ``evil'', following the "enclosure" movement of earlier times (see also The Transportation Experience), but in this, enclosing an entire metro area for the purposes of raising toll revenue (profits). No new value is being created, in fact value is being destroyed as wealth is transferred and an otherwise useless wall is constructed to ensure excludability. (Unless there was a congestion problem, and Doofenshmirtz uses time of day pricing to manage demand, I just suspect this is unlikely).
In Candace Loses Her Head " he's going to use his Drill-inator to tunnel to China, then charge tolls."
In this case, he is adding value to the world (from a transportation perspective), and needs the revenue to pay back the Research and Development costs of the Drillinator, leave aside the operating and construction costs. This seems not terribly evil, but perhaps unsound.
Doofenshmirtz: Ah, Perry the Platypus! Your timing is impeccable. And by impeccable I mean: COMPLETELY PECCABLE! [Laughs] Your just in time to witness my latest scheme. Behold, my Drill-Inator! I will bore a tunnel to China, build a toll highway, and make millions!
Doofenshmirtz: The molted lava of the earth's core completely slipped my mind.(Which reminds me of Transatlantic Tunnel)