Should Road Surface Grades Be Classified?

[SanAlejandro]

Road surface grades are classified into four levels based on the composition of surface materials, structural strength, traffic capacity, and usage quality: high-grade pavement, sub-high-grade pavement, medium-grade pavement, and low-grade pavement. Below is a brief introduction to road surface grades: 1. Grade Material Types: High-grade surface materials include cement concrete, asphalt concrete, factory-mixed asphalt macadam, and neatly laid block stones. Sub-high-grade surface materials include asphalt penetration macadam, road-mixed asphalt macadam, asphalt surface treatment, and semi-neat block stones. Medium-grade surface materials include mud-bound or graded macadam, water-bound macadam, irregular block stones, and other granular materials. Low-grade surface materials consist of various granular materials or locally improved soils, such as slag soil, gravel soil, and sandy gravel soil. 2. Applicable Roads: All road grades suitable for highways include expressways, first-class, and second-class roads.