I'm sure 1 is a road, but what are those bumps on the side?I'm guessing 2 is a footpath. I have no idea what 3 is, if you don't know what it is, fine, let's leave it at that. I searched for what might be 4 and my best guess is that it is some kind of embankment.
Edit: It's a German map of Memel city around year 1921-1945
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