Thank you for your concern about our noble feral youngsters. I'm sure it is difficult has got to be a difficult decision in many cases, but necessary in others. The odds don't help when the nests are directly above areas of extreme traffic, by foot or car.
I think if they are in immediate danger, or soon to be danger-it is obvious of course, they should be removed. It also would depend on how far along they are in maturity and their flying skills,and their health... and take into account if any predators are close, whether human, animal or bird and inclimate weather. Also, if you are able to come back, to check again makes it easier to leave them. I would go by my gut instinct and also when in doubt...I would take them to safety.
I think if they are in immediate danger, or soon to be danger-it is obvious of course, they should be removed. It also would depend on how far along they are in maturity and their flying skills,and their health... and take into account if any predators are close, whether human, animal or bird and inclimate weather. Also, if you are able to come back, to check again makes it easier to leave them. I would go by my gut instinct and also when in doubt...I would take them to safety.