When almost everyone has one we could make them compulsory (like another country does).Then we could link them to a compulsory account.Then all we have to do is put readers on all roads and rake in the money .We could put speed detectors everywhere and automatically deduct accounts. Dont think that bureaucrats are not already thinking about it. When they do it us sheeple will all accept it as we do for everything else (they do not really need etags as number plate recognition is almost good enough already)it is just that they have to condition us to accepting tolls that should not be charged in the first place