What is a notable disadvantage of using mast arms for traffic signals?

Mast arms are sizable structures used to support traffic signals, and one significant disadvantage relates to the need for large foundations. This requirement arises due to the added weight and height of the mast arms, which necessitate a stable base to ensure structural integrity and safety. The larger foundations can increase installation complexity and costs, as greater excavation, materials, and engineering considerations are necessary.

In contrast, while high installation costs, limited visibility, and excessive weight could be concerns in various contexts, they are not as directly linked to the foundational challenges presented by mast arms. The need for robust structural support is a primary consideration when implementing these systems, making the large foundation size a critical disadvantage in their use.