In my Biology SE question Identify this large, beige or pine cone-colored squareish beetle and/or the pine cone it's on? I included a snapshot of a poster I saw when hiking. I was told that it advises that the beetle shown in the photo is a pest. I can at least recognize that it begins with what looks like "小心!" There's no date on the poster but I assume that it's modern and not a historical reproduction.
I saw this poster while hiking in Taiwan.
I noticed that there are (almost always) a pair of phonetic characters (注音?) next to each Chinese characters. In Taiwan I see books of sutras and other prayers written this way, but I've never seen a public announcement that looked like this.
Is there any particular reason why this particular public notice would require the phonetic characters? Are they there as a courtesy? Is this considered artistic or stylized in any way? Does this make it more accessible (easier to read) or look more "official"?