system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What are toll roads or "turnpikes" used for?

Where does the money collected by toll roads go and what is it used for exactly, entering a new country is understanderble but they have toll roads on highways where there is no border so what is the purpose of these stops which take unnecessary fees??
gpt
In a lot of cases the state or city has decided that they need a new highway from A to B to alleviate congestion on some existing roadway. But building massive highways is expensive. So they go to a highway building consortium and say "we want a highway from A to B and we want YOU to build it (and pay for building it). In return we'll let you charge $x per vehicle for the first 10 years the highway is in operation then we'll take it over or buy it off you". 

Then the highway corp goes, builds it and makes money off it. Then some toll roads become free (once its been "paid" for), or sometimes the state or whatever takes it over and continues to charge for it. In that case the money is used to maintain the toll road itself, or to help maintain other roadways under the same department of transport or roads or whatever.

The 407 toll highway here in Toronto was to have become free once it paid for itself, but one of the provincial governments chose a quick cash grab, sold it to a private corporation who continues to milk $0.50/km out of people - it turns out that people are willing to pay $20 a trip to avoid sitting in the 401 parking lot for 3 hrs.