Deepblue2k8 4-way Junction
An easy 4-way junction named after Deepblue2k8, a user on the tt-forums who posted it there: 
- Just 2 turns for direction change with enough space between them.
- Branch before merge
- Easy to build
- Branches have different length
- Takes up large amount of space
- Many bridges
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.