Final answer:
Holding position signs commonly feature white inscriptions on a red background, which ensures they are highly visible and universally recognized in traffic control situations.
Step-by-step explanation:
Holding position signs typically have white inscriptions on a red background. These signs are universally recognized in the context of traffic control and road safety, where they serve to instruct drivers to stop and remain in position until it is safe or they are instructed to proceed. While the question itself refers to holding position signs, it seems to be related to airport runway signage or similar traffic control situations rather than road traffic signs, which can sometimes also have yellow inscriptions on a red background. However, with the given choices, the correct answer is that holding position signs have white inscriptions on a red background, ensuring high visibility and recognition by those who must adhere to the signs' directives.