Here's an interesting article with quirks in the UK numbering system. Among other things there are houses that go into negative numbers, and dual streets on there. 

On 11 September 2018 at 07:27, Richard Aiken <xxxxxx@gmail.com> wrote:
A 3D environment might officially use XYZ coordinates from a central location, read out most commonly from an inertial locator (a cheap and basic model, such as appears in a couple of CT adventures IIRC).

On Mon, Sep 10, 2018, 8:28 PM Cian Witherspoon <xxxxxx@gmail.com> wrote:
A few extrapolations for Traveller
Dome colonies/ spoke cities: radial/ distance from center, could be either streets or blocks (5th spoke, 8th ring, or local names for them)
Underground, stations: level, hall, maybe general zone?

Maybe we create a few example cities that use various methods for Jeff to include?

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