How do I......

[NASCAR_Guy]

Make Avenue Roundabouts,I still haven't figured it out 

[Serkanner]

The NAM has a Avenue Roundabout lot puzzle piece. You can find it in the Road menu of the game.

[Jonathan]

Serkanner: make that puzzle piece 
when you install the NAM you must select the Avenue Roundabouts Plugin.
In the Road menu there should an icon of a roundabout click that and place it, then drag avenue from the sides.

[Serkanner]

Oops    ... I mean puzzle piece of course ... 

[M4346]

Also be sure that you have the LATEST version of the NAM (i.e. Jun/Jul 2007) and that you delete the middle four grass tiles after you placed the puzzle piece.