Notwithstanding any general or special law to the contrary, the Massachusetts Department of Transportation shall design and implement a temporary pilot program at the Sumner, Callahan and Ted Williams Tunnels with the intention of testing the technological feasibility of charging toll rates that are different depending on time of day, with the goal of relieving congestion for motorists. The program shall include a discount structure including off-peak discounts of at least 25 per cent. Only vehicles with transponders issued by the commonwealth shall be eligible for discounts. Provided further that the program shall project to result in a total projected toll revenue loss of no more than $100,000 and shall commence no later than October 1, 2019. No later than 60 days following the conclusion of said program, the department shall transmit a report to the clerks of the house and senate detailing the scope of the program, implementation challenges, lessons learned, and proposed next steps to use tolling policies as a means to alleviate congestion on roadways.