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Diverging Diamond Railway

In my experience, DDIs are the highest-capacity freeway-to-street interchange you can possibly make (though they are not exclusively limited to freeway-to-street situations).

Advantages:

• Greatly reduces the # of conflict points and thus the chance for human error
  
• Makes left turns far easier since there is no opposing traffic when you turn
  
• Safer due to better visibility of oncoming traffic
  
• Higher speeds due to gentler curves and better angles of merging
  
• Higher capacity than most interchanges
  
• More direct paths of travel than a large roundabout (Ex: In a roundabout, time is wasted traveling 3/4 around a circle to make the left turn and 1/2 way around the circle to go straight)

Disadvantages:

• Requires more land to build
  
• More complex to setup properly
  
• Higher construction and maintenance costs

• Diverging diamond over ground freeway
  
• Freeway carriageways are spaced 48 units apart for those using the Parallel Road Tool mod
  
• Center space can support a railway or one 2-lane highway if you need left side ramps
  
• Recommended for heavy traffic volumes

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