If bull bar or front mounted - 3.5 metres from the ground
If roof mounted - 2 metres above the roof
... but the way it is worded is poo.
It reads that if you have a bull bar then that is where the flag has to go IE not on the roof and if you have no bull bar and use the alternative roof mount it has to go on the front of the rack.
That is NOT how everyone else on the planet control their safety flag specs and location
http://www.environment.sa.gov.au/par...gional_Reserve