Dallas-Ft.Worth highway System. Phallic symbol? What's your opinion?

If you look at the map of the DFW area, you might not see it.  But when you see the map on a daily basis, you start to see it.  And, once you see it, that's all you see, and you laugh everytime you see a map of the area.  What do you think?  How did they get away with this?  Was this really an accident?