What material is commonly used for traffic signal poles?

Traffic signal poles are commonly made of steel due to several beneficial properties that this material offers. Steel is known for its strength and durability, making it suitable for withstanding heavy weather conditions and impacts from vehicles. It can support the weight of the traffic signals and endure the stresses placed on it from wind and other environmental factors.

Additionally, steel can be treated or coated to prevent rust and corrosion, which is essential given that traffic signal poles are exposed to various elements throughout their lifespan. This treatment enhances their longevity compared to some other materials.

While other materials like aluminum are also used for some applications, particularly in environments where weight is a concern, steel remains the most prevalent choice for traffic signal poles due to its overall robustness and adaptability in urban infrastructure contexts. Wood, although historically used in some areas, does not offer the same durability and maintenance-free characteristics as steel, and plastic lacks the load-bearing capacity needed for sturdy traffic control structures.