That's definitely a good point, but in this particular case the picture posted elsewhere in the comments by raquo [1] looks like it could fit or almost-fit a parclo (possibly in a slightly elongated/compressed arrangement). The more hippie side of me is tempted to suggest that if you can't afford the land, you shouldn't be building an expressway there :)

[1] http://www.inside-lane.com/wp-content/uploads/2009/11/Diverg...