An easy 4-way junction named after Deepblue2k8, a user on the tt-forums who posted it there: [1]

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A straight forward basic 4 way junction.

Pros

• Just 2 turns for direction change with enough space between them.
• Branch before merge
• Easy to build

Cons

• Branches have different length
• Takes up large amount of space
• Many bridges

Improvement

Using both bridges and tunnels, we can reduce the number of hills for the trains, so that each train has at most one up-hill.

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Modification of the juction to reduce the number of hills, using both bridges and tunnels.