Understand the characteristics of road transportation; 2. Be familiar with the history, status quo and planning of road development, and understand the requirements for road design (macro level: layout, grade coordination, etc.; microlevel: safety, mobility, etc.) ; 3. Grasp the principles and methods of road classification and grading; 4. Comprehend the relationship between road class selection and design elements, design vehicle, design speed, traffic volume, capacity and other design control factors; 5. Master the main contents and objectives of the course and the relationship with related courses.