Bridges, especially elevated bridges, differ from rail models as they are three-dimensional rather than flat, necessitating an interlaced layering effect. This is primarily conveyed through varying shades, contour lines, and shapes. Techniques are generally categorized into three-dimensional and flat production methods. The flat production method is typically used when the bridge is an accessory. To showcase the bridge itself, the three-dimensional method is generally preferred, as it clearly depicts the size and elevation of the bridge. Specific methods are as follows:

1. Hierarchical Representation: Display the height, dimensions, and levels of the bridge using contour lines. During painting, colors transition from light to dark from top to bottom, creating a shadow effect for a more realistic visual appearance.

2. Width and Narrowness Representation: During the construction of bridges, visual errors can be utilized to reflect the width and narrowness, rather than strictly adhering to proportional reduction. Instead, certain widths can be intentionally enlarged to create a distinguishable difference in width visually.

3. Perspective Representation: Since we usually view models from above, the green belts and guardrails on both sides of the bridge should be made taller to ensure they are visible.

4. Fixed Model: The completed model must be securely fastened to the base platform. Therefore, the application of adhesive can be done in sections, ensuring each segment is not overly long, and reinforcing the joints for stability.