Longest distance between stoplights

[amroad17]

US 220 has a long stretch now in PA.  With its freeway from Beford to I-80 and it not having any signals on the two lane road south of Bedford into MD along with its concurrency with I-68, it would be over 100 miles for sure.

I have not been north of I-80 on US 220 yet, so I wonder exactly where US 220's southernmost traffic signal now is located at?  Also, where is MD's northernmost signal?  If I knew where both are, I could figure out how long of a signal free US 220 you would have.

US 15 between the MD/ PA line and Federick, MD is signal free.  Plus there is a long freeway bypass of Gettysburg, PA north of the state line, so both together make a long stretch.

I believe the northernmost traffic signal in MD for US 220 is at exit 42 off of I-68.  PA's southernmost signal is either at exit 15 off I-180 near Pennsdale or in Hughesville, about 4 miles east--unless there is one near Jersey Shore, PA.

[KEK Inc.]

US-26 from OR-6 to US-101.  (~60 miles)

U.S. 26 neither has stop lights at Oregon 6 nor U.S. 101, both are grade-separated interchanges.  So you're actually looking at somewhere on U.S. 101 to downtown Portland, around 80 miles (and 75 of that on 26 alone).

OP said no multi-lane carriageways.