护栏网的作用是什么？
护栏网是一种用于防护和安全的装置，主要用于道路、桥梁、铁路等场所的隔离和保护。其主要作用有以下几个方面：
防护：护栏网可以起到防止行人或者车辆越界进入危险区域的作用，避免意外事故的发生。
安全：在交通繁忙的道路或者桥梁上设置护栏网，可以提醒驾驶员注意行驶方向，提高行车安全性。
美观：护栏网的设计也可以美化城市环境，增加城市景观效果。
维护：对于一些需要维护的设施，例如隧道、涵洞等，可以在两侧设置护栏网，以便于人员的安全进出和设施的维护工作。
总之，护栏网的主要作用是提供防护和安全保障，同时也能美化城市环境，提高人们的生活质量。
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