Pre-Signaled Modified Cloverleaf
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Railway Junctions
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Deepblue2k8 4-way Junction
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Ultimate 3-way junction for 4 tracks
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Note
This needs a much better picture

This is a pre-signaled modified cloverleaf, with the possibility of U turns on special tracks. It's based on the Building depots which uses pre-signals to give priority to the trains on the main line. The exits from the mail line are before entrances, reducing traffic problems (Fig.1).

Fig 1. - A pre-signaled modified cloverleaf junction

Pros:

Cons: