code: protected void setupRoadBorders(ZoomableGraphicsContext gc, RoadPolyline element) {
  		final Color color = gc.rgb(getDrawingColor(element));
  		gc.setStroke(color);
  		final double width;
  		if (element.isWidePolyline()) {
  			width = 2 + gc.doc2fxSize(element.getWidth());
  		} else {
  			width = 3;
  		}
  		gc.setLineWidthInPixels(width);
  	}
docs: Setup for drawing the road borders.
  
  @param gc the graphics context.
  @param element the element to draw.