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Quick: Explain the difference between West Glebe Road, South Glebe Road, and all the other sorts of Glebe Roads out there. Where do they start and end? How do they interact with Route 1, I-395, and other major NoVa thoroughfares? If you haven’t been stumped by Glebe or by one of the many other critical byways of the Old Dominion, then you can’t call yourself a Washingtonian. Make extensive use of MapQuest, GPS, and other direction-helpers, and remember this: You can get to Spout Run going north on the GW Parkway but not going south.