all bonds and other securities issued pursuant to the provisions of this chapter must be payable solely from the proceeds of fuel taxes collected by or remitted to the county pursuant to chapter 365 of NRS, as supplemented by this chapter. Receipts of the taxes levied in NRS 365.180 and 365.190 and pursuant to the provisions of paragraphs (a) and (b) of subsection 1 of NRS 373.065, paragraphs (a) and (b) of subsection 1 of NRS 373.066 and paragraphs (a) and (b) of subsection 1 of NRS 373.0663 may be used by the county for the payment of securities issued pursuant to the provisions of this chapter and may be pledged therefor. Such taxes may also be used by a commission in a county whose population is 100,000 or more for the payment of bonds or other securities issued pursuant to the provisions of this chapter and may be pledged therefor if the board of the county consents to such use. If during any period any securities payable from these tax proceeds are outstanding, the tax receipts must not be used directly for the construction, maintenance and repair of any streets, roads or other highways nor for any purchase of equipment therefor, and the receipts of the tax levied in NRS NRS 365.190 must not be apportioned pursuant to subsection 2 of NRS 365.560 unless, at any time the tax receipts are so apportioned, provision has been made in a timely manner for the payment of such outstanding securities as to the principal of, any prior redemption premiums due in connection with, and the interest on the securities as they become due, as provided in the securities, the ordinance, in the case of securities issued by a county, or the resolution, in the case of securities issued by a commission, authorizing their issuance and any other instrument appertaining to the securities.
NRS 373.131