Where does toll road money actually go?

I'm reading the HCTRA financial statements and I've got a few questions:

– ~$130 million of toll money is transferred to help county roads (2020 financials, page 4, note a). Does this mean toll road money is being used to maintain non-toll roads?

– It seems HCTRA is making a profit of ~$300 million per year. This seems like a very large profit margin. Why aren't tolls being reduced to keep the account more balanced?

Simple math looks like tolls could be cut in half if the goal was simply to balance the system…where is this money actually going?