title: Google maps marking path between 2 points over streets
body: <p>Maybe it's not the first similar question but anyway:
  I'm looking for a kind of functionality to 
  make available to mark the vehicle path across the
  city streets between two points in city (for example A and B),
  including the turns and etc.
  Is there some facilities?
  If not please offer some idea how it can be done.
  Will be appresiated for any help :)
  Hope I was clear.  </p>