The source of the data determines how the road is encoded. If you are using
OSM, its typically a set of line segments (ways) that determine the length, and
is styled with some width based on the type of road (highway vs path, for
example).
Styling is also variable, and heavily dependent on the geometry and attributes
in your source data.
Again assuming OSM, the styling isn’t usually a real polygon, but instead is
two lines, one drawn over the top of another. If you picture two roads that
join at a T intersection, you don’t want a closed polygon for each road. What
you want is for the roads to look like they are merged. So draw a thick black
line for each road first, then draw a white (background colour) line for each
road over the top, but slightly thinner. Now all you see is the outline, which
is what you want.
Brad
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