Multi-elevator systems have been talked about for a very long time, similar to trains. The problem is still that these layover spots or crossover points take up

Multi-elevator systems have been talked about for a very long time, similar to trains. The problem is still that these layover spots or crossover points take up floor space. And one bad elevator has the potential to jam up the whole system, compared to today where one bad elevator only impacts its shaft. Manhattan actually has a parking cap; with Manhattan today, the view is that building more parking mostly just encourages people to use it, and to accommodate Manhattan's existing land use would probably require paving over Manhattan, the rivers surrounding it, and a whole lot more.