I'm new to openstreet maps and the geojson format.

I'm drawing buildings and roads using GeoJson. A Building is represented as a Polygon, thus i can create the proper geometry as needed, but a Road is represented as a LineString, thus i only get to draw them as lines, and i lack information about the width of it. 

This question: http://gis.stackexchange.com/questions/101823/drawing-roads-with-different-widths seems to imply there's a way to get the width of a road using GeoJson (and also, the look of the roads as shapes instead of lines as the link's picture is what i'm looking forward in my project). 

(image borrowed from above link's)
![image took from above link's][1]

It's there in the GeoJson format data for road width/shape I'm failing to find in the GeoJson file ?
If not, it's there any sort of convention for road width i can use to draw my roads?, like estimated size

To be clear, i'm not trying to get the very exact shape of any given road, but i would like to draw roads as shapes just as the picture when possible, or at the very least understand how i can come close to achieve that.

Thanks.


  [1]: https://i.sstatic.net/PUyGn.png