Which method is preferred for assessing soil stability for highway construction?

Geotechnical testing and analysis is the preferred method for assessing soil stability for highway construction due to its comprehensive and scientific approach. This method involves a series of tests that provide detailed information about the soil's physical and mechanical properties, such as its bearing capacity, shear strength, moisture content, and compaction characteristics. These factors are critical in determining how the soil will behave under the loads imposed by highway structures and traffic.

Through geotechnical testing, engineers can identify potential issues such as soil liquefaction, erosion, and other stability concerns that could affect the integrity of the highway. This data-driven approach helps in making informed decisions regarding design, materials, and construction methods, ultimately ensuring the safety and longevity of the roadway.

While visual inspections and soil sampling can provide some insights, they lack the depth and reliability of information that geotechnical testing and analysis can deliver. Consulting with local farmers may offer anecdotal insights about the land but does not replace the need for rigorous scientific evaluation necessary for any civil engineering project.