There is no agreement with respect to that. Federal law simply conditions federal funds on compliance with the standard. If the state wants the money, it complies with the standard. If it doesn't care to get the money, it can do something else.
But even if there was an agreement, that would not help you. State law is what it is; if you violate it, the state may penalize you for it. If the signs that the state relied upon do not conform to the standard, the state might lose some funds, but that's all. It does not get you out of your ticket problem.