This law has been in Tassie for a while now and I have not heard of this causing any problems, I have witnessed the opposite both in Tassie and on the Hume Hwy when the Traffic spotted the flashing lights all vehicles automatically slowed to the 40kph limit and both being on a dual lane carriage way they also moved into the right hand lane without being directed by Police, which I thought was awesome giving everyone on the site the extra room.