The two details that best support the inference that suspension bridges are designed for areas like Niagara Falls are:
- The weight of a suspension bridge roadway is supported over water by a system of cables.
- Towers are built on either side of a waterway and cables are stretched across the water to connect the towers.
These details emphasize the structural design of suspension bridges, which is particularly suitable for spanning large bodies of water, such as those found at Niagara Falls.