They had to draw a line somewhere if not wanting to list every single indiscretion that isn’t allowed. Otherwise there would be much more paper to carry with more writing that wouldn’t be read. I am going to go out on a limb here and suggest that the omission is a legacy issue from a time when permit holders were credited with the posession of common sense, insight and a degree of judgement, when it was not considered necessary to explicitly state the fact.
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