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they may at least suggest the types of problems that arise elsewhere. And again may it be emphasized that, in all nations, it is far better to make even limited efforts to keep open existing open spaces than to defer all activity until a theoretically perfect result is achievable. Indeed, as indicated at the outset of Part III, a theoretically ideal result from the point of view of noise abatement alone may be, in the United States, an unsupportable public invasion of private rights, in addition to costing more money than is likely to be available. 58