Questions:
1.What materials are commonly used for bridges?Why?
(I'm sure one of it is steel but we need the reason why =P)

2.How does the Load Capacity of a bridge affect its structure?What improvements can be done to increase Load Capacity?

3. What are the man-made, natural and climatological factors that should be considered in construction of bridges?

3. What should be checked on the location where the bridge is supposed to be built?(preferably about the nature of the area like length to be bridged and no longer about climate and weather)

4. Is the Design or Aesthetics of the bridge also considered in the construction?Why?

Thanks in advance ^^