There was an effort to remove the speed camera warning signs, but ultimately they were left in place. Between 2011 and 2013, new speed cameras were installed with no advance warning of their locations at all. If you google the words radars panneaux you will be able to see what these signs look like.
There is a difference between tripping a speed camera and receiving a ticket. Until recently, few foreigners driving rental cars received tickets when they were caught by speed cameras. However, the National Police have expanded their collection efforts and now contact violators with the help of their rental companies. Rental companies typically charge renters up to 25€ for this service. Many vacationers have received fines from the National Police weeks after their return home.