Taxi way lighting
It is 20 years since I last operated out of Heathrow. At that time, taxi instructions consisted of " follow the green lights, stop at red cross bars" Minimal R/T chat, brilliantly simple, and virtually fool proof. ( even I could cope)
I have since heard that because other airfields did not have a similar system, this had to be dropped, as it was deemed "non standard". True or false?