My tailplane is seldom in a position to come into contact with obstacles, my wing tips regularly are.
As long as I stay on my taxi line I should have correct separation from other machines. If I am in doubt, I either move off the line or stop. I seldom know for sure how my wing tips are for clearance.
Thanks for the smartarse, snide comment to a reply I made to someone who appears think that wingtips are always in sight.
