Statistically there is no measurable risk of mid air collision in class G airspace. During NAS the risk assessment for class E airspace was (from memory), one in ten to the minus five. There is one death per year attributed to mid air collision of recent time in the whole of Australia.
how many mid-airs (including gliders) in G (including CTAF) this year alone!? ... me thinks your statistical risk modelling is smelly!
There is a requirement for the use of radio in the CTAF where applicable which gives alerted see and avoid. As with the gliders, the highest risk being in the near vicinity of aerodromes.
A requirement? .. really? ... it is all just recommended isn't it?
... alerted see and avoid ONLY if the traffic is known, and is reporting accurately!
.
And before you try it on, OCTA collisions are
not comparable with high density GAAP, remembering that GAAP is (when VMC), a high volume traffic alerting and sequencing service
ONLY, and only to airbourne traffic. The only
separation provided in GAAP (in VMC) is
runway separation!!!. In IMC, separation of arriving and departing traffic is timed one in one out (due the small CTR dimensions)!
.
Imagine GAAP without ATC?
