6. If a noise payment has been made in relation to an eligible home arising out of the construction alteration or use of a highway, whether under regulation 3(1) or under regulation 3(3), no further noise payment may be made in respect of that eligible home arising out of the construction alteration or use of that highway unless that highway is subsequently altered and a power to make a noise payment in respect of that eligible home arises as a result of that alteration or the use of the highway as so altered.