Make sure it wasn't signed as 40km/h on the road the before the T intersection. If not, then it would have been 50km/h. Take photos. Mark the location as accurately as possible of the speed camera and also ALL speed zone signs in 500m each of the 3 directions. Take it to court. Win.
Just make sure the road you turned off of wasn't a 40km/h otherwise that is the limit which would apply as you turned either left or right off of it until sign posted otherwise.
