So you used the file posted on the first page....
I suppose that you folowed directions all the way, and the links are correct, and files placed in right catalouges. If all that is OK then when you go into the poi menu and do a search for cameras, some of them should pop up on the search menu, then just exit.
The reason you are doing this is becouse the car wil show the icon for last searched poi, whitch in this case would be the speedcameras.
Please note that the files posted are free and may not be complete, so if you cant se camera in your area, it just might be that the database posted is not that good.

__________________
X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005