Could SafeZone be used in place of flashing roadside speed signs?
Yes, although this is up to the road authority deploying the warning systems. Because SafeZone is intended as a supplementary system, as are the road-side or over-road flashing speed signs you might have seen (as distinct from the painted pole mounted signs at the start and finish of every School Zone in NSW), it could be used in place of flashing speed markers or other advisory systems.