它的首要目标是维护美国历史道路的完整性和重要性，同时也为现代安全标准敏感实施提出目标。
The primary goal is to preserve the significance and integrity of Americas historic roadways while allowing for sensitive implementation of contemporary safety standards.
尤其在道路工程中，因其数量多、工程量占总工程比重大，其安全运行的重要性日益突出。
Especially in civil engineering, its importance of security becomes obvious day by day for their excessiveness in quantity and the proportion of the work.
应用推荐