There is a tool in Bentley Map that will draw these lines. Information on Bentley Map is at
http://www.bentley.com/en-US/Products/Bentley+Map
Keith Raymond
The tool shown by Keith Raymond was removed in Bentley Map SS3. When I inquired about it I was told by someone at Bentley that it would be replaced by a new tool in MicroStation.
Rod WingSenior Systems Analyst