

Apparently its based on the field rotations in the motor or something, remember this is a fixed gear vehicle. I don’t think ICE cars use a gear either anymore, its based on the crankshaft sensor for the EFI, multipled by a gear ratio figure in the ECU. Even pushbikes don’t have gear sensors for speedo reading, they count magnetic fluctuations in the rim.
This is pretty standard treatment. There are only a limited number of holding cells in an airport, moslty for men.
If there is no returning flight that day they are sent to a local jail (known as a remand centre outside of the US) and stripping and searching is standard at those places.
The women said that they were going to do work in the US.