title: How to get road direction vector from coordinate input to google maps api or directions api
body: <p>I am working on a project that requires I plot markers at metropolitan coordinates via the Google Maps API.  I can plot the markers just fine and draw polygons easily, but I need to draw polygons parallel to the road common to each coordinate and if possible, find traffic direction.  Each coordinate input is verified to be next to a road in a a downtown metropolitan area.  Is it possible to get that information from the Google Maps API or open streets API?</p>
  
  <p>A sample coordinate is [47.6018, -122.314].</p>