Absolutely, if unable to park and need to stop short, MUST tell ATC.
When taxiing around a busy airport in a large wide body, you just can not really know where the wingtip is.
Can not see it remember.
When every thing is right there is an incredibly small separation, only a few meters to spare. That's why various
sized planes are assigned a category. e.g. a 777 would not be parked on a gate near taxiway unless that part
of the airport is available to that category of plane.
One has to trust the system i.e. the markings and the others doing the right thing. If in doubt, stop, of course,
but if everyone stopped pedantically, busy airports would grind to a halt.
Until we know more, see my first line above.
But please note I did use the words...'if in doubt, stop'
Last edited by Deepinsider; 14th May 2018 at 13:37.