Had an amusing incident with a speed camera some years ago. On the major freeway south of Sydney, some electronic signs had just been erected in an interchange where the speed limit was lower. They were testing them with some speed cameras. I had already slowed to about 70km/h because my turn off was just over the rise, but the guy next to me was still going rather faster. As it happened, he passed me just as we both got to the ideal spot to see the at that point blank new sign and suddenly up comes the message "Your speed: 90km/h" with an arrow to his lane and then it changed to "Speed limit: 70km/h". He slowed down in a very visible hurry!

I still think they should leave it like that when they didn't have any other message for it...

Wade.