Interstates with No Auxiliary Routes by FlaxmanR

Question 9

Interstate 66 has an interchange with the George Washington Memorial Parkway just before it crosses the Potomac to enter the District of Columbia, appropriate as this section of the highway is also a “Memorial Parkway” named for a specific family. What last name, from her first husband, did Martha Washington – née Dandridge – have at the time she married George in 1759?