What is evaluated during the assessment of existing pavement conditions before rehabilitation?

Answer: B — Load-bearing and structural integrity

The assessment of existing pavement conditions before rehabilitation is crucial to ensure that any necessary repairs are comprehensive and effective. Evaluating load-bearing and structural integrity allows engineers to determine how well the pavement can support the anticipated traffic loads. It involves examining factors such as the thickness of the pavement layers, the strength of the materials used, and identifying any underlying issues like subgrade failure or moisture infiltration that could compromise the pavement's performance. This comprehensive evaluation goes beyond merely checking the surface wear or conducting a visual inspection, as these methods might miss critical structural problems that could lead to premature failure after rehabilitation efforts. Understanding the load-bearing capacity is vital, since it informs decisions about the extent of rehabilitation work needed, ensuring that the pavement will remain safe and serviceable for its intended lifespan. Other aspects, such as existing signage conditions, are important for overall road safety and functionality, but they do not directly address the pavement condition itself. Instead, focusing on structural integrity provides a thorough understanding of what rehabilitation measures are necessary to enhance the pavement's lifespan and performance.