Comment by Dusseldorf

My town in the US has something like this. Several portable toilet trailers that are typically stationed near public gathering areas all year round, and moved to accommodate large events. They're significantly nicer than porta potties, and are about on par with any public bathroom accessed from outside. They require the ability to either scan a QR code, or send/receive SMS. They've always been clean any time I've used them, and have some mechanisms to report cleanliness issues back to toilet HQ.