I have another thought on this - If only the prettiest women are picked, who decides which ones are rejected? Is there some beauty "test" they have to pass? With a panel of judges maybe, where the girls are evaluated and scored - kind of like a beauty pageant.
I can imagine possibly even with a swimsuit competition, complete with a 10 point scoring system ( 9.9, 9.7, 10!! etc.), during which there could even be officials with tape measures that come out and with trembling hands take each girls womanly measurements, like the way it was done in the first Miss America pageants.
And I wonder who made the rule that only pretty women are qualified to be Pyongyang Traffic Police?
It would be a terrible feeling to be a "rejected" applicant, deemed not pretty enough to be able to direct traffic.