This is the era of the cell phone. Why would you ask a passerby to do that which you can do easier and better yourself? I am assuming you are in a coverage area, which is actually pretty likely if you are on a major highway. If you are in an isolated area, a drive by is more likely to spontaneously inquire if you need assistance without any sign being displayed.
My experience has been that getting outside assistance has not been a significant problem. I, for one, regularly stop, or, at least, slow down, survey the situation, and make eye contact and/or inquiries.
Just because you may be travelling on a major highway does not imply cell coverage. Up here, on many major highways, there are some stretches of 60-100 miles that don't have cell coverage.
A good resource I now use when travelling is
Open Signal Maps. This website interfaces with Google Maps and allow you to search for cell towers near where you may be. (When searching, zoom in on the map to see more tower locations) Although not complete, I have been able to find cell towers in areas that I would not of known and can possibly make a difference when the chips are stacked against you.
That said and as you have mentioned in another post popping the hood open (and turning on the 4 way flashers) around here will almost always guarantee that someone will cautiously slow down and ask if you require help.
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