I meant to say "country roads," not "county roads," and I think it was a single state highway all the way. Back then the ICC didn't exist at all.
Prior to completion of MD-200, there was
no continuous east-west state-maintained road across Montgomery County with the sole exceptions of MD-193 (does not serve the same travel market as MD-200, since it runs well inside the Beltway between U.S. 29 and the Prince George's County/Montgomery County border, and stays inside the Beltway until it reaches Greenbelt) and I-495 (Capital Beltway itself).
MD-28 (has various names) between I-270, through Rockville and then on to the northern reaches of Silver Spring ended at MD-182 (Layhill Road) and still does.
Headed east, MD-198 (also has various names) picked up at MD-650 and continues east past U.S. 29 into Prince George's County to an interchange at I-95, then through the City of Laurel and into Anne Arundel County to an interchange at the Baltimore-Washington Parkway and ending at an interchange at MD-32.
The combination of Montrose Road/Montrose Parkway, Randolph Road, East Randolph Road and Cherry Hill Road go across Montgomery County from I-270 almost to I-95 (nearly all of this is county-maintained) and much of it is a four lane residential street, also not intended to carry the traffic to which it is subjected. It is at least four lanes all the way now, though the usual suspects that campaigned against MD-200 (and sometimes touted in bad faith "upgrade existing roads" as an alternative) were also loudly opposed to improvements along Randolph Road.
Between MD-28 and MD-198 was a long-standing gap, which was eventually spanned by Norbeck Road Extended, a county-maintained road. But the combination of MD-28, Norbeck Road Extended and MD-198 was (and is) nearly all two-lane undivided, and much of it is old design, suitable for a low-volume rural road, which this is not - describing it as a "country road" is accurate.