Transponder Demand Surges during Run-Up to Massachusetts AET Conversion reports, “Massachusetts transportation officials are ‘doing the best we can’ to keep up with demand for transponders as the state is about to switch to all-electronic tolling on the Massachusetts Turnpike. . . .” The department says it issued 151,470 transponders from August 22 to date (compared to a total distribution of 44,389 over the same period in 2015). State highway administrator Tom Tinlin reports there are 5.6 million registered vehicles in Massachusetts and 2.8 million transponders now in use.