Why are so many traffic signs made of aluminum disc circle?

1.Aluminum discs have good corrosion resistance properties
2.The density of aluminum is only about one-third of that of steel, and its weight is light
3.Aluminum alloy also has good processability and weldability.It's easy to polished, easy to paint or coat, and strong plasticity
4.Aluminum is highly reflective
5.Unlimited recycling

Aluminium Circle For Traffic Sign Details

Хӯлаи алюминий	Ғафсӣ(мм)	Диаметр(мм)	Табиат
1050, 1060, 1100	0.2-9.0	20-1500	О, H12, H14, H22, H24
3003, 3004, 3105	0.2-10.0	20-1600	О, H12, H14, H22, H24
Material process	CC AND DC (DC For cookware and CC for traffic sign)
	DC for cookware with good deep drawing and spinning
	Further Fabrication	Расмкашии амиқ, Spinning, Анодизатсия
Сатҳи	Ба охир расидани фабрика, or color coated or anodized
MOQ	3МТ
Quality Standard	ASTM B209, EN573-1
Бастабандӣ	Standard export worthy wooden pallets,фармоишӣ
Loading Port	Any port of China
Таҳвил	1. By sea: Any port in China 2. By train: Chongqing(Yiwu) International Railway to Middle Asia-Europe