This ingeniously designed public restroom in Hong Kong fits 8 urinals into 2.5 square meters, thus making full use of a limited space. I mean, they could have put in just 2 or 3 urinals, but that would have been wasteful.
Link -via Geekologie | Photo: SCMP
That's why everyone will have to pee in sequence, and for a pre-determined time duration to ensure a smooth flow of traffic in and out of the restroom.
The logistics are, admittedly, tricky.