Which pavement widening requires sampling and testing?

In the context of pavement widening, sampling and testing are critical to ensure that the quality and structural integrity of the pavement are maintained. When pavement widening is 4.0 feet or greater, it typically signifies a significant alteration that may impact the existing pavement’s performance and the overall roadway condition.

Widening at this magnitude necessitates careful evaluation of the materials being used and the existing pavement's ability to bear additional loads. This is because the structural characteristics of the base and surface layers must be carefully assessed to ensure they can accommodate the new configuration without compromising safety, durability, or lifespan. Testing is essential to verify that the materials meet specified standards and to provide important data on factors such as strength, compaction, and moisture content.

In contrast, smaller width increases, like those less than 3.0 feet, might not significantly alter the pavement’s structural performance and therefore may not require extensive sampling and testing. Options indicating widths less than 4.0 feet do not present the same level of concern regarding the structural implications of the existing conditions and the new materials, resulting in a reduced need for testing.