The book presents a comprehensive overview, starting with the fundamentals of material science and the challenges of conventional road construction. It then examines various types of self-healing liquid materials, such as polymer-based liquids and microcapsule-embedded systems, detailing the chemical reactions enabling self-repair. Finally, it addresses engineering aspects, economic impacts, and environmental benefits, using case studies and simulations to illustrate large-scale implementation possibilities. This approach bridges the gap between technical research and practical application, making complex concepts accessible to a broad audience.