I am in favor of private toll roads (shocking, I know
)there is a great incentive to build them faster to start collecting the tolls that just does not exist in the public sector.
They amount of roads that have come up that filled a massive need for east-west highways in this area was filled incredibly quickly versus some public projects that were smaller in scope and took much longer to finish.
The "tax" on driving on the road is an option .. or not. Don't want to pay it, drive on the access road or other roads, it will take you longer, but it is "free" and still faster than if the toll road had not opened to start.
The secondary benefit (if you are talking about goods/services moving on those roads) ... are paid .. in the price of the goods services.
It has been a good source of funding for other projects. Denton County for example, took their portion of the toll road lump sum payment and built out a 23 mile rail line that connects to other rail services that cover 120-ish miles of rail. No federal funds involved and used it to fund other road projects.
When 'x' ends, the state can take it over (or I assume extend the lease) and collect the tolls directly. Add to that, they are cheaper to operate now than at anytime in the past (toll tags versus toll booth workers)
Main benefits to me are an influx of funding, a general reduction in traffic congestion (both from the toll roads and the rail projects they helped fund) the roads get built faster (or in some cases it is the only way they would be built), no tax funds, a contractual obligation to maintain the roads while they collect, and the almost certain cost over runs the taxpayers are on the hook for in public projects.
There is little downside to me and massive benefit.