An aggrieved resident snapped a picture of the man while driving past and posted it on a Facebook group.
The man was wearing a jacket and appeared to have his pants pulled down intentionally as he stood on the side of the road facing oncoming traffic.
The man is unidentified and his motives are still unknown.
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In November last year, in what was possibly an unrelated incident, another man was spotted walking around naked near Zoo Lake, he was subsequently taken by Rosebank police to the Helen Joseph Hospital.
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Related article: Naked man wandering around Zoo lake