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The Spread Diamond Interchange is a conventional interchange design. It has four ramps, two on-ramps and two off-ramps. The “Spread” in the name refers to the spacing between the intersections which are spaced far apart. The reason why this is done is that the increased distance allows for more storage space on the ramps. Additionally this design allows for further expansion should additional loops be required in the future.

A Synchro Analysis was conducted on the Spread Diamond Interchange to determine whether or not it was capable of handling the predicted 2040 traffic volumes. Unfortunately, the interchange was not capable of handling the predicted 2040 traffic volumes. This is because the difference between this interchange and the No-Build is the spacing of the ramp entrances and exits and the number of lanes. The high volume of traffic is flow across the bridge and the largest impediments to this flow are the high-volume left-turn movements. The Spread Diamond and Diamond type interchange in general does nothing to divert or reduce these impediments. The result is a level of service of F at both intersections. For this reason the Spread Diamond Interchange is not considered a viable interchange alternative.

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Result:  Failed

Spread Diamond Interchange

Traffic Analysis

Viability

The Spread Diamond Interchange failed the traffic analysis step in our selection process with an unaccetable level of service.  Therefore it is not considered viable and was rejected at that step.

 F

 F

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