Signing for a future

Studying warning signs, I became fascinated with the potential use of text and context. The CAUTION sign above is the only one I made using synthetic canvas material, but have yet to consider its proper placement. I have looked at the possibility of approaching vacant land due for development and bringing to attention planned building activity. I am not sure though, of the legalities surrounding such action. Might it be trespassing?

The picture above was taken at a vacant field behind my home in Pasir Ris, located at the eastern end of Singapore. There is no planned development in this context. I was merely testing how the 1.8m x 1.8m sign would look in a space like this. From afar, it actually looks rather small.