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).

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Fig 1. - A pre-signaled modified cloverleaf junction

• Traffic jams less likely.
• Can handle a large number of trains at a time.
• Exits from main line are before entrances, reducing the chance of traffic problems.

Cons:

• Very costly to build.
• Trains must slow down to climb a slope.
• Trains must slow down during sharp turns.
• Trains must turn left to turn right. This could lead to trains getting lost. (Can be fixed by using waypoints).