Billboards are a blight. But they generate a serious amount of money for the owners of the land they sit on. The Gregory Project, by Slovakian firm DesignDevelop, has created a tiny triangular house on stilts that could be used as housing for the homeless. They tell designboom:
The proposal increases the functionality of the structures in a way that the insides could be turned into living spaces. Such an object would produce minimal maintenance costs, which could be paid through the rental space of its façade.
A drawback is that highways are not usually near the kind of services that the homeless need. However the single most important need is affordable housing. This isn't such a silly idea.
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This is not the first time we have shown inhabited billboards: