Highway 407 is a great example of what for profit highway systems look like: high prices, dynamic pricing, tons of hidden fees. Prices per mile are something like $0.80-1.00USD (for passenger cars), not including a few bucks in fees. When I traveled to Toronto for work, my bill per trip on the 407 was at around $50USD. This was in around 2014 and I imagine that prices have gone up a lot since then.

According to wikipedia, for each dollar collected by the 407, $0.21 goes to maintenance, and $0.79 to profits ($0.66 are paid out in dividends). The 407 collects $1.3 billion dollars annually with double-digit annual growth.

Private roads are economically unsustainable and serve only to leech wealth from society.