Plan of rejected diverging diamond interchange in Findlay, Ohio
A diverging diamond interchange is a rare form of diamond interchange in which the two directions of traffic on the non-freeway road cross to the opposite side on both sides of the bridge at the freeway. It is unusual in that it requires traffic on the freeway overpass (or underpass) to briefly drive on the opposite side of the road from that which they are accustomed. Image File history File links I-75_US_224_interchange. ... Image File history File links I-75_US_224_interchange. ... Findlays position within Hancock County (foreset) and Ohio (background) Findlay is a city located in Hancock County, Ohio. ... A typical diamond interchange A diamond interchange is a common type of road junction. ... High-capacity freeway interchange in Los Angeles, California. ...
Like the continuous flow intersection, the diverging diamond interchange allows for two-phase operation at all signalized intersections within the interchange. This is a significant improvement in safety, since no left turns must clear opposing traffic and all movements are discrete, with most controlled by traffic signals. Additionally, the design can improve the efficiency of an interchange, as the lost time for various phases in the cycle can be redistributed as green time; there are only two clearance intervals (the time for traffic signals to change from green to yellow to red) instead of the six or more found in other interchange designs. Some of the intersections in the design can be unsignalized. The left turn from the freeway off-ramp, for example, can form an auxiliary lane that then becomes an exit-only lane for the entrance ramp to the freeway in the opposite direction. Omitting the traffic signals for the left turn movements off the freeway only works well with single left turns and when short queues exist within the interchange on the arterial street. A continuous flow intersection, also called a CFI, is an at-grade intersection that moves the turn conflict (to the left where traffic drives on the right and vice versa) out of the main intersection. ...
The first US diverging diamond interchange is currently being planned in Kansas City, Missouri. The Missouri Department of Transportation plans to use this design for the intersection of I-435 and Front Street in eastern KC.
External links
48.832115° N 2.152859° E Map of a diverging diamond interchange in Versailles, France
Diamondinterchanges are used where a freeway crosses a minor road.
In the United States, where this form of interchange is very common, particularly in rural areas, traffic on the off-ramp typically faces a stop sign at the minor road, while traffic turning onto the freeway is unrestricted.
The diamondinterchange makes more efficient use of space than most types of freewayinterchange, and avoids the interweaving traffic flows that occur in interchanges such as the cloverleaf.
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