**Horizontal reflectors** are commonly known as **"cat's eyes"**. These devices are used on roads to reflect vehicle lights, helping drivers see the road better, especially in low visibility conditions. Although the provided texts do not directly mention reflectors, the concept of a **retroreflector** is similar, as both reflect light to improve visibility. Retroreflectors are placed in different parts of vehicles and have specific colors depending on their location, but reflectors are installed on the road. The function of reflecting light is what connects reflectors to the term "cat's eyes," as both play a crucial role in road safety by improving nighttime visibility.