Describe the process of designing and implementing a large$-$scale civil engineering project, such as a bridge or highway system. Discuss the various phases involved, including feasibility studies, site selection, environmental impact assessments, engineering design, construction planning, and project management. Consider the role of stakeholders, regulatory requirements, budget constraints, and risk management strategies in the overall project lifecycle. Evaluate the challenges and considerations that engineers must address throughout each phase to ensure the successful completion of the project and the safety and sustainability of the built environment.