also without any burning, fire effects, or aircraft operations https://www.blm.gov/press-release/bureau-land-management-issues-temporary-restrictions-black-rock-playa
With the last Black Rock City map for scale -- it's of a similar size to the real Burning Man, without any porto-potties.
@marcan42@twitter.com explained:
> I bet it's SuperSpeed/UAS one way and High Speed/USBMS the other.
> This happens because you need a mux to handle flipping the SuperSpeed lanes, but not the USB2 ones. Cheapo Chinese designs omit it, which is not compliant with the standard.