Proof rolling must be performed in the presence of which professional?

• A. Architect
• B. Engineer
• C. Geotechnical Technician
• D. Inspector

Answer: (B)

Proof rolling is a field check of the subgrade bearing capacity and compaction before placing pavement. Interpreting what the rolling results mean—identifying soft spots, excessive pumping, or insufficient compaction—and deciding what corrective action is needed must be done by a licensed engineer who has responsibility for the project design and specifications. The engineer reviews the field indicators, compares them to the project criteria, and signs off when the subgrade meets the required standard or directs remediations like additional compaction or stabilization. While others such as inspectors, geotechnical technicians, or architects may observe, measure, or document results, they do not provide the formal acceptance decision that the engineer is responsible for.