When the road and bridge or bridges of a plank road company, included within the terms of section 27:20-1 of this title, have been acquired, maintained and operated at the joint expense of the boards of chosen freeholders of the counties in which such road and bridge or bridges are located, under the provisions of sections 27:20-4 and 27:20-5 of this title, and such road and bridge or bridges have been taken over by the state highway commissioner as a part of the state highway system all rights, powers and duties of the boards of chosen freeholders relating to the road and bridge or bridges shall devolve upon the boards of chosen freeholders separately, within the territorial limits of their respective counties, and no such board shall expend moneys in connection with a road and bridge or bridges outside of the territorial limits of its county.