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Pavement Chalk

On my way into work this morning, I saw a young man in a rucksack making his way up my road, stopping every 20 metres or so to chalk on the pavement.

I crossed to see what he was writing. In most cases, it was a circle with what looked like "NO" written in the centre. One, however, said "CND".

Baffling. I wish I'd asked him, now.

Is writing CND in chalk on the ground common behaviour?