The last couple of go-arounds I have done have been due to 'vehicles' on the runway, aircraft that is, a bit too slow getting out of the way. Oddly enough both happened when I was about 3 miles out, one at night the other around midday.
A previous G/A was initiated in the flare, at night, when I flew into a wall of water, a passing shower moving rapidly across the field. No mucking around then, I was outa there.
I did the standard G/A every time. I had a fair idea that a tight circuit or orbit was out of the question so cleaned up and had a radar vectored trip around the local area for another approach.
If you do the same thing every time then you won't set yourself up for a screw up.
Aircraft in question, a B767.
Regards,
BH.