I was at the NSW MCC meeting where their safety rep(who does an incredible job) briefed everyone on the situation(in NSW at least) with metal road plates that are used to cover construction works. We all know they are as slippery as hell. He said there is a standard that says that the plates are not allowed to be installed if they haven't been coated in a specialised paint. The paint is designed to provide a certain amount of friction that equates to about the same as a painted line on normal tarmac ie. still slippery but not quite as bad as bare metal. The paint is supposed to be coloured red or a lightish gray. Maybe joel from Mogo can elaborate on this. If this is the case(and I for one don't doubt the information from this guy) then if you are approaching a metal plate and it isn't red or light gray then pay extra special attention. Also, if you see some plates that don't have the paint or the paint is worn, then you can rightly report it as a hazard and the council/RTA should fix it. For those so inclined, would be interesting to investigate what similar standards are in place in other states.