Diverging Diamond interchange
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A Diverging Diamond Interchange (DDI) is a compact and relatively low-cost Grade Separated Junction. It differs from a standard Diamond interchange because the minor road's carriageways invert within the junction.
The junction type was first seen in France in the 1970s, with many examples being added in the United States from the 2000s onwards. There are no current known examples in the UK or Ireland.
The traffic is controlled by a two phase design, meaning it is relatively efficient at moving traffic through the interchange.
Diverging Diamond Variants
Some variants to the design exist, with additional sliproads being added to improve traffic flows.