Requires a regional transit authority that includes portions of a county with a population of more than 1.5 million and that imposes a motor vehicle excise tax to: (1) Establish a market value adjustment program to be implemented by December 31, 2017;

(2) Provide a credit against the motor vehicle excise tax due; and

(3) Allow an additional one-time credit against the motor vehicle excise tax due to a taxpayer that paid the tax in 2017.