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Make sure to watch the directions on this road - all interchange descriptions assume it to go E-W but the direction changes several times.

27 395 Washington Blvd Pentagon	50 WEST Arlington Blvd 50 EAST Rosslyn Key Bridge			50 WEST Falls Church 50 EAST Washington	Washington Blvd Clarendon	cloverleaf
27	Second St S Fort Myer			Second St S Fort Myer	27 Washington Blvd Clarendon	SW extended trumpet with NW leaf
27 395 Richmond Washington	244 Columbia Pike Navy Annex Baileys Cross Roads			244 WEST Columbia Pike Baileys Cross Roads 244 EAST Columbia Pike Navy Annex	27 Fort Myer Clarendon	NE, SE, NW 7 ramp parclo
27 Washington Blvd Pentagon Arlington Cemetery Rosslyn	395 SOUTH Ridge Rd Richmond 395 NORTH TO 1 SOUTH Washington (right merge from I-395 NB)			(left merge from I-395 NB/Ridge) 395 SOUTH Ridge Rd Richmond (right merge from I-395 SB/Hayes)	27 244 Washington Blvd Columbia Pike	weird 3Y/Y/Y I-395 exit 8
27 Washington Blvd Memorial Br	Pentagon South Parking 244 WEST Columbia Pike Navy Annex Pentagon Mall and River Entrance			Pentagon South Parking RESTRICTED LANES HOV-3 ONLY MON-FRI 3:30-6 PM (I-395 SB) 244 WEST TO 27 Columbia Pike Navy Annex (WTF? the best way to 27 is to stay on 27 :P)	27	cloverleaf plus 2Y at I-395 HOV
27	110 NORTH Pentagon North Parking Entrance				27 395 Washington Blvd Columbia Pike	1/4 cloverleaf
27 1 Parkway Memorial Bridge				Pentagon Mall and River Entrance	27	weird
	George Washington Memorial Pky SOUTH (right merge from GWP NB) Memorial Bridge Arlington Cemetery (left merge from Arlington Brg/Cemetery) 50 27 WEST George Washington Memorial Pky NORTH			(right entrance from GWP SB/US 50 EB/ Pentagon) Pentagon North Parking George Washington Memorial Pky SOUTH (right entrance from VA 27/GWP NB) (coming from Arlington Brg/Cemetery)	27 395	weird

Thanks to Russell Blau for info.