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66	EXIT 72 29 124 Lee Hwy Spout Run Pkwy			66 WEST Front Royal	66	half diamond
66	EXIT 73 29 Lee Hwy Rosslyn Key Br			EXIT 73 29 Lee Hwy Rosslyn Key Br	66	diamond
66	EXIT 75 110 SOUTH Pentagon Alexandria				66	Y
66 50 Roosevelt Bridge Washington				50 WEST Arlington Blvd G W Parkway NORTH	66	Y-Y
66 Potomac River Fwy NORTH Whitehurst Fwy	ALT         50 EAST Independence Ave 50 EAST Constitution Ave                  (right exit) E Street			JF Kennedy Center E St ALL TRUCKS MUST EXIT ALT         50 EAST Independence Ave KEEP LEFT	66 50	weird
29	Rock Creek Pkwy Pennsylvania Ave 29 SOUTH Whitehurst Freeway				66 E Street Expressway Kennedy Center Theodore Roosevelt Bridge	weird

Thanks to Russ Blau for info.