The left-hand 40km/h sign southbound on Herring Rd Marsfield at Kent Rd Public School was knocked over by a truck in late 2008. The sign has still not been replaced. 

Herring Rd Marsfield missing 40km/h sign
The left-hand sign southbound on Breakfast Rd Marayong is an ancient, faded, non-standard sign that does not comply with the current Road Rules 2008. Fortunately there is a very visible flashing lights sign on private property right next to it.

Breakfast Rd Marayong outdated 40km/h sign
Twin Rd North Ryde also has ancient, non-standard signs in both directions:

Twin Rd North Ryde outdated 40km/h sign