A local government in a rural area has decided to replace an old, deteriorating concrete bridge with a new timber bridge. The new bridge will be constructed over a river and will provide access to a popular hiking trail in the nearby mountains. The government has hired a team of engineers and architects to develop a design plan for the timber bridge. Based upon the case study, briefly explain the following requirements for timber bridge. Material requirements Structural requirements Environmental requirements Safety requirements Answer each in 30-80 words