Sevententh, Get driving Directions.
Thought I'd share what I've found to retrieve a route plan and directions listing.

I've added a line to Add Route method
GDirections f = new GDirections(String.Format("From {0}, {1} to {2}, {3}", start.Lat.ToString(CultureInfo.InvariantCultu?re), start.Lng.ToString(CultureInfo.InvariantCultu?re), end.Lat.ToString(CultureInfo.InvariantCulture?), end.Lng.ToString(CultureInfo.InvariantCulture?)));

You'll also need Json.NET which can be found at codeplex http://www.codeplex.com/Json for converting the routes.

It also gives the duration of the route at each stage and the overall travel time
Hope this helps in any way possible

Alex