October 2016 is supposed to be a deadline for national electronic toll interoperability according to MAP-21, but when doesn’t the government extend its own deadlines.

Meanwhile, the best info I can find on toll interoperability (the reciprocity agreements):

TollInterop_med.jpg

 

And why October 2016 might be a pipe dream (the technology/protocols used):XponderCommProtocolsMap_Lg.jpg