I see signage posted and use of volunteers at various points, Oak. I've been on local self-guided rides myself on streets and path combination.
Most interestingly, in large guided rides for over 100 riders or more, I see high school students or older, usually paired in 2's at various points. (I know in some schools it goes towards their volunteer work efforts..especially for established non-profits.)
Use of spray on paint is incredibly rare. Just not a common practice in our neck of the woods: not surprising since municipalities have to deal with rules etc. and if some routes run through lovely looking neighbourhoods...near where I've lived, the routes do go through expensive areas.



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