Residential location v employment location in Washington DC

I wonder if Melbourne has maps like this. If yes, why haven't we seen them?
Here's a link to the post: http://greatergreaterwashington.org/post.cgi?id=2821

I wonder if Melbourne has maps like this. If yes, why haven't we seen them?
Here's a link to the post: http://greatergreaterwashington.org/post.cgi?id=2821