N.B: It is very important to investigate the cost involved in construction. This influences whether or not you are awarded the tender and your overall design. The local authority will not award a tender to a very expensive contractor. So when choosing the type of bridge, keep in mind the cost factor. Research the cost of the bridge: Make a research on the different aspects of the bridge and write down the estimated realistic prices of each of the aspect to be used. a. Materials: Estimated total amount of the materials needed. b. Labour: Mention the labour force that you are going to need and the total amount of money you will need for labour.

To investigate the cost involved in construction and make a research on the different aspects of the bridge, we need to consider the following factors: a. Materials: Estimated total amount of the materials needed: - Steel or concrete for the bridge structure - Reinforcement materials (rebars, etc.) - Waterproofing materials (paint, sealants, etc.) - Other materials (cement, sand, gravel, etc.) b. Labour: Mention the labour force that you are going to need and the total amount of money you will need for labour: - Skilled labour (engineers, architects, etc.) - Unskilled labour (labourers, etc.) - Specialized labour (electricians, plumbers, etc.) To estimate the realistic prices of each aspect, we can consider the following sources: - Local market prices - Industry standards - Previous construction projects Please provide the specific details or requirements for the research on the different aspects of the bridge and the estimated realistic prices of each aspect.