Which phrase is permitted for directing ground traffic?

The phrase "Proceed on runway #, hold short of runway #" is explicit and clear, making it the correct choice for directing ground traffic. This instruction specifies the exact runway involved and provides the critical directive to hold short of another runway, ensuring that the pilot understands both their movement on the airport surface and the need to maintain safe separation from active runways. Clear and precise communication is vital in air traffic control to avoid misunderstandings and to maintain safety on the ground.

In contrast, the other options lack the necessary clarity and precision for guiding ground traffic effectively. For example, "Cleared on all surfaces" is vague and could lead to confusion since it does not specifically indicate which areas or runways a pilot may use. The phrases "The field is yours" and "The airport is yours" are informal and non-specific, and they do not provide actionable instructions that ensure pilots understand their responsibilities while on the ground. Clarity in communication is paramount in air traffic control to prevent potential incidents or accidents.