Describe the concept of "design build" in highway projects.

Answer: C — method where design and construction are by a single contractor

The concept of "design build" in highway projects refers to a project delivery method where both the design and construction services are contracted by a single entity, typically a contractor or a partnership of firms. This integrated approach facilitates a streamlined process, allowing for better collaboration between the design and construction teams. It can lead to faster project completion times, cost savings, and enhanced efficiency because the contractor is involved early in the project, which can aid in identifying potential issues and opportunities for innovation in both the design and execution phases. By having a single point of responsibility, the design build method can reduce the risk of miscommunication and conflicts that may arise when design and construction responsibilities are separated. This collaboration can also enhance creativity in problem-solving, as the contractor can provide input on constructibility during the design phase. In summary, the essence of the "design build" approach is its holistic integration of responsibilities that promotes teamwork, efficiency, and quality in delivering highway projects.