What point is the apex of a bridge?

since most bridges are level, I find the term questionable.

I expect that in such problems, we're talking about the apex of the supporting structure, which is often a parabola. That would then be the vertex of the parabola.

The apex of a bridge, also known as the highest point or summit, refers to the peak or highest elevation of the bridge's arch or structure. To determine the location of the apex, you can follow these steps:

1. Identify the type of bridge: Different bridge designs have varying apex points. The most common types include arch, suspension, and cable-stayed bridges.

2. Research the bridge's specifications: Look up the specific bridge you're interested in by name or location. Find any available architectural or engineering plans, diagrams, or photographs that provide information about the highest point or the shape of the bridge.

3. Consult reliable sources: Visit authoritative websites such as government transportation departments, bridge engineering organizations, or academic resources specializing in bridge design. These sources often provide technical details and drawings that can help determine the apex point.

4. Examine the bridge's profile: If you have access to images, photographs, or aerial views of the bridge, study them to identify the highest point. In the case of an arch bridge, for example, the apex would correspond to the highest spot on the arch above the roadway.

5. Observe the bridge in person: If feasible, visit the bridge and visually inspect its structure. From different angles, you might be able to determine the highest point by observing the shape, curvature, or supports of the bridge.

Remember that the apex of a bridge may not always be accessible or visible to the public, especially in the case of large or complex structures.