Personally I think that the single most effective separation measure that VFR pilots can apply is never flying at round-number levels. I avoid like the plague levels such as 2,000' and 3,000 if I can.
On a related issue, some time ago I floated the idea (it gained no traction at all
) of reviewing the use of mandatory IFR cruising levels. As we know, we are
obliged to use semi-circular IFR cruising levels when flying IFR outside CAS. I just cannot understand what that achieves by way of safety. It just concentrates low-level IFR traffic (the guy flying on an IRR and slipping under Class A) into a very small number of altitude bands - where he is then at
increased likelihood of meeting another person doing exactly the same! I do not understand what would be lost by allowing such a pilot to select his own IFR cruising level.
And before someone says 'but surely the idea of the semi-circular rule is that they're all flying the same way' you just have to look at it to see that that's nonsense. If I'm flying IFR on a heading that is more or less north or more or less south then I'm potentially going to face traffic on a more or less reciprocal heading +/- a few degrees at
exactly the same level because we're both obliged to use that level. Crazy and, as far as I can see, pointless.