[Graybeard58]

I lived in D.C. in the mid 60s but am no longer familiar with the geography of the area but do remember traveling between D.C. and Baltimore from time to time and it was a slow moving parking lot of a highway between those two cities even back then.

I don’t remember the highway number.

[ConorMacNessa]

I believe you're referring to the Baltimore-Washington Parkway. In the 60's, that was the only limited access highway between the cities. The alternatives were U.S. 1 and a little further west, U.S. 29. I-95 between Baltimore and Washington was opened in 1971, IIRC. I once drove south on I-95 in my uncle's 1950 Chrysler Windsor at over 110 mph. Can't do that anymore.

America demands Justice for the Fallen of Benghazi!

Genuflectimus non ad principem sed ad Principem Pacis!

Listen, O isles, unto me; and hearken, ye people, from far; The LORD hath called me from the womb; from the bowels of my mother hath he made mention of my name. (Isaiah 49:1 KJV)

[Albion Wilde]

There are three main highways between DC and Baltimore: MD Route 29, Interstate I-95, or Route 1.

[Albion Wilde]

Other than the B-W Parkway — oops!