Historically, collision barriers have been widely utilized in various aspects of life, providing convenience to our era. In the process of appearance modification, it should be avoided to be fragmented and chaotic. There are three reasons for the diversity and lack of uniformity in the composition of the barriers: regardless of the bridge type, the methods to seek ancient bridge railings appear without skill.

Excessive decoration or intricate carvings, with patterns lacking regularity, are a missed opportunity. For instance, a stone bridge railing pillar top featuring characters, small animals, and items, lacks a cohesive theme that elicits laughter; each prefabricated component of the railing is excessively small and crowded. The appearance of the railing should complement the bridge design, as it is an integral part of the overall structure of the highway bridge. It should enhance the aesthetic appeal of the bridge, thus the railing's design must harmonize with the bridge's style.

The aesthetic features of contemporary growth highways and bridges are characterized by elegance, lightness, slender grace, and continuous product flow. The guardrails should also be relatively elegant and light, incorporating the rhythm of continuous product flow, avoiding disarray, odd shapes, or distortions that could distract drivers during their journey, thus forming unsafe elements. The Okinawa Seiji Interchange in Japan features guardrails, posts, and lighting trees made of aluminum alloy, which are refined and bright, harmonizing with the bridge design, and possess a particularly strong sense of dynamic flow.

In reverse, the local areas that we often pause to admire, such as urban People's Bank bridges or road bridges at tourist attractions, should be carefully planned with a sense of aesthetics. As for the collision barriers, like the diagonal cables of a cable-stayed bridge and the standing main tower forming an umbrella-like silhouette, it is advisable to adopt a refined design with additional handrails on the guardrails. This appearance appears gentle and stable and can complement the balancing force of the cable-stayed bridge. The bridge structure should mainly emphasize horizontal and straightforward lines, with the guardrail appearance appropriately varied to modify the previously simple condition.