I have not seen a Process Map associated with constuction work. I have been asked to urgently prepare one for a highway project. I would appreciate any suggestions.

Take a look at these threads - they may get you started

http://elsmar.com/Forums/showthread.php?t=19603
http://elsmar.com/Forums/showthread.php?t=21125

And try the search function - type in "construction" and you will get a number of threads that may help.