"At first, this was a surprise, as in my native UK I can literally give a street name within 50 miles of where I am, and the driver cocks their head for a second, gears whir, and yes! They know it!"

I'm not sure where in the UK you are, but if you pick a street at random (i.e. give all streets within 50 miles equal weight, and pick a name out of the hat), it's far from guaranteed that a taxi driver would know where it is, and how to get there.

- <30 square miles: The area within 6 miles of Charing Cross, within which London taxi drivers must know every single street.

- ~606 square miles: The area of Greater London, within which London taxi drivers must know the main roads.

- ~7800 square miles: The area "within 50 miles of where I am"