If it peels off without damaging the underlying sign, it's probably fly-posting rather than criminal damage.
True.
But then if this http://www.timeshighereducation.co.uk/news/university-of-london-chalk-protest-sparks-arrest/2005792.article and and http://www.thisisbristol.co.uk/homepage/Bristol-student-s-criminal-damage-charge-writing-pavement-chalk/article-785596-detail/article.html can be criminal damage, I'm sure a sticker can be too. Shouldn't, but can.
@s785 started
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True.
But then if this http://www.timeshighereducation.co.uk/news/university-of-london-chalk-protest-sparks-arrest/2005792.article and and http://www.thisisbristol.co.uk/homepage/Bristol-student-s-criminal-damage-charge-writing-pavement-chalk/article-785596-detail/article.html can be criminal damage, I'm sure a sticker can be too. Shouldn't, but can.