(b) The Triborough bridge and tunnel authority shall be authorized to provide additional credits, discounts and exemptions informed by the recommendations of the traffic mobility review board and a traffic study that considers impact. 4. The Triborough bridge and tunnel authority shall implement a plan to address credits, discounts, and/or exemptions for for-hire vehicles as defined by, and subject to a surcharge imposed by, article twenty-nine-C of the tax law for a for-hire transportation trip, informed by the recommendation of the traffic mobility review board.