Which of the following devices is not typically used for road delineation?

Road delineation is essential for guiding and informing drivers about the roadway layout, and it typically involves various visual aids. Pavement markings, guide posts, and reflective delineators are all common tools used in road delineation.

Pavement markings, such as painted lines and symbols, are used on the road surface to provide direction and information to drivers. Guide posts serve as visual indicators of road alignment, hazards, or important locations, helping to enhance visibility, particularly in low-light or adverse weather conditions. Reflective delineators, often installed along the edges of roads, help improve visibility of the road layout, especially at night or during poor weather, thus aiding in safe navigation.

In contrast, speed bumps are not considered a road delineation device; they are traffic calming measures designed to reduce vehicle speed. While they do influence how vehicles interact with the roadway, they do not provide directional information or aid in road navigation in the same way that delineation devices do.