Works as a hidden subway, for rural sparsely populated tiles.
Useful or any place you need a subway, but where you would prefer just a plaza or grass park.
Visually a ferry, which works as a subway.
These lots will provide a simple driveway extension to connect visually to MTP and SPAM growable lots, especially lots that have been zoned on diagonal roads. They are also useful for wherever filler parking is needed.
Links now point to the SPEX on the STEX.