Requires a regional transit authority to: (1) Once it has expended eighty percent of the funding elements identified in a regional transit system plan adopted by the authority board in June 2016, hire an independent auditor to determine if remaining unspent funding elements are sufficient to complete the system plan as approved by the authority's voters in 2016; and

(2) Propose a ballot proposition to be submitted to the voters of the authority if the auditor determines remaining unspent funding elements are insufficient to complete the system plan as approved by the authority's voters in 2016.