Final answer:
Without context or relevant standard references, it is not possible to provide the minimum width of a control zone correctly.
Step-by-step explanation:
The student's question seems to pertain to a measurement within safety management, particularly regarding the dimension of a control zone. However, while the other provided information is relevant to the general topic of measurement, it does not offer a direct answer to the specific question about the minimum width of a control zone. Thus, due to insufficient information directly correlated to defining what a control zone is and the regulatory or industry-standard minimum width, I must refrain from giving an incorrect or speculative answer.