As this discussion some questions have come up. Here are some answers.
Where exactly do monies come from to fund NOVA? Funding comes from a portion of the gasoline tax and off-road vehicle use permits. For more information click this link.
What are the restrictions that apply to the spending of NOVA funds? There has been quite a bit of discussion on this topic. If you want to explore the formal rules a bit more they are described in Manual 13 – Nonhighway and Off-road Vehicles Activities. Click that link and you will find this information on pages 8-10, especially Figure 1 on page 10.