It’s not classified as “secret”, but this information is still promlematic for being published in the internet. The porpuse of the signs is to guide soldiers to the bases (And that’s why these signs written only in Hebrew). When we take all of this signs and we map them, it’s may be problematic. I mean, it’s the same like the bases itselfs - IDF are not trying to hide most of their bases by the real world but they are trying to prevent people from mapping it so people who trying to harm Israeli Bases would work harder to do so. (That the basic idea stands behind)