Which of the following statements is applicable prior to and during the installation of loop wire in traffic loops?

The statement about not allowing vehicular traffic over an open saw cut is essential because it emphasizes safety and the integrity of the installation process. Open saw cuts can create hazardous conditions for both the installation crew and the public. If vehicles are allowed to drive over an open saw cut, it could lead to further damage of the cut, misalignment of the loop wire, or even injuries in the case of debris being dislodged. Maintaining a clear area free from traffic allows for the safe and effective installation of the loop wire without compromising the quality of the work or endangering safety.

The other statements may involve best practices in loop installation, but they do not address the immediate safety and structural integrity concerns associated with open saw cuts. Overlapping saw cuts at corners might not be a routine requirement, thorough cleaning is indeed crucial but secondary to ensuring safety during the installation, and caution regarding the use of plastic sleeves is relevant, yet does not compare in priority to managing vehicular traffic over an open cut.