MD-88 (complete)
MD-91 (complete)

Got it.

I noticed that on March 14 user tomdrums(3) editing Valley Field Rd in Timonium to Ps. This is not a Ps by wiki definition, nor is it the Baltimore County official designation. In fact, it is a no trucks over 3/4 ton street, which I tried adding to the intersection. Any idea why that user would have done that?

https://www.waze.com/editor/?zoom=4&lat ... 90&env=usa

Working from the southern tip clockwise around the county to I-83, all the following are complete:
MD-648>>>mH
Landsdown Rd>>>mH
Hollins Ferry Rd>>>mH
Hammonds Ferry Rd>>>mH Needs to extend to AA Co
US-1 Alt>>>MH
US-1>>>MH
Selford Rd>>>mH
Sulfur Spring Rd>>>mH
MD-166 (Rolling Road)>>>mH or MH depending on location
UMBC Blvd>>>mH
MD-372 (Wilkens Ave)>>>mH
Maiden Choice Ln>>>mH
Frederick Rd (MD-144)>>>MH
Bloomsbury Ave>>>mH
Ingleside Ave>>>mH
Edmondson Ave>>>mH
Johnnycake/Academy Rd>>>mH
Woodlawn Dr>>>mH
Security Blvd (MD-122)>>>mH
Windsor Mill Rd>>>mH
Liberty Rd (MD-26)>>>MH
Patterson Ave>>>mH
Millford Mill Rd>>>mH
Old Court Rd (MD-133)>>>mH
Brenbrook/McDonogh/Painters Mill>>>mH
Winlands Rd>>>mH
Owings Mills Blvd>>>mH
Marriottsville Rd>>>mH
Lyons Mill Rd>>>mH
Red Run Blvd>>>mH
Berrymans/Church/Franklin>>>mH
Nicodemus Rd>>>mH
Cherry Hill Rd E>>>mH
Main St / Reisterstown Rd (MD-140)>>>MH
Central Ave>>>mH
Hanover Rd(MD-30)>>>MH
Worthington/Tutton/Shawan Rd>>>mH
Slade/Smith Ave>>>mH
Park Heights Ave(MD-129)>>>mH
Stevenson Rd>>>mH
Greenspring Valley (MD-130)>>>mH
Greenspring Ave>>>mH
W Seminary Ave(MD-131)>>>mH
Padonia/Broadway>>>mH

Here's another post that I will update with work that needs to be done in BaCo that I can't "reach":
Jarrettsville Pike >>> MH

I think he was probably looking at the google maps which has it marked as a minor artery, or maybe he just has local experience.
My guess.

Need someone who can reach out to the end of Broening Hwy to mH>MH this for me:
https://www.waze.com/editor/?env=usa&zo ... 8,22197227