Via The League of Ordinary Gentleman, I'm informed about Narrow Streets Los Angeles, a blog that uses the magic of Photoshop to recast the urban landscape in the City of Angeles. For example, here is an image of an actual intersection:

cities before2.jpg

And below is an image that shows, far better than words ever could, why the width of a street matters:

cities after2.jpg

Visit Narrow Streets LA for more.