4 How are freeway bridges built?

Freeway bridges are typically built through a multi-step process that includes design, site preparation, and construction. The process begins with engineering designs that consider factors such as load capacity and environmental impact. Next, site preparation involves clearing the area and laying foundations, often using piles or footings to support the structure. Finally, the superstructure is built, which can involve precast segments or on-site assembly of materials like steel and concrete, followed by finishing touches like paving and barriers.