Transsagittarian Hyperlane Network
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The Translactean Hyperlane Network refers to a series of hyperlanes in the Milky Way galaxy controlled by the United Federation of Star Systems which acts as the primary backbone of transgalactic travel within the Milky Way.
History
During the era of the Lactean Confederacy, as human presence became more widespread throughout the galaxy, singular hyperlanes became less and less sufficient to maintain the needed trade and especially military transit between the main regions surrounding Sol and the peripheral regions, especially those on the other side of the core. While the concept of a transgalactic route has been floated as early as 5,000, it wasn't until 12,800 when such proposals were seriously considered and a number of feasibility studies conducted.
Around this time, new developments in space-clearing technology significantly reduced the cost of hyperlane construction and enabled longer single hyperlane jumps, from just over 100 light-years to nearly 1,000. This significantly changed the calculations for the construction of such a transgalactic lane, as this meant that it could be constructed for an order of magnitude less in cost. Soon enough, a route which circumnavigated the difficult core region was accepted as the going plan, and several existing hyperlanes were integrated into the plan.
Route
The course of the network is not a single uninterrupted jump - in fact, it is typically designed so that a single jump would take approximately four hours - roughly 600-700 light-years in the rimside or 100-150 light-years nearer the core, and this allows both for travellers not seeking to go the entire way of the route to exit at a convenient position or for the route to be constructed flexibly not in a straight line.
There are two main types of routes within the network, rim-core and the loop. The loop route circles the Core Systems just slightly outside of the bump in density, while the rim-core routes link the loop to the four termini systems. There are no specific connection points between the rim-core routes and the loop, and the rim-core route splinters and widens into multiple systems upon contact with the main loop.
The four termini systems, all located in the galactic rim, are:
All four of which are major human population centers with Earthlike planets (or, in the case of Sol, with Earth as a planet) prior to the completion of the network, and afterwards became even more populated.