I-15/Limonite Ave Interchange
Improvement Project
The Single Point Interchange is a non-conventional interchange type that reduces the number of intersections required from two to one. This is possible by all right turns being displaced away from the intersection and all left turns and through movements being concentrated at the center.
A Synchro Analysis was conducted on the Single Point Urban Interchange to determine whether or not it was capable of handling the predicted 2040 traffic volumes. Unfortunately, the interchange design is incapable of handling the predicted 2040 traffic volumes. The reason for this is because the highest volume of traffic is moving through the bridge which means the greatest impediments to that flow are the high volume of left-turns. What a Single Point Interchange does is it concentrates these left-turns into a single point which exacerbates the impact they would have had if separated. Consequently the only intersection received a level of service of F. Because of this the Single Point Interchange was not considered a viable option as an alternative.
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Result: Failed
Single Point Interchange
Traffic Analysis
Viability
The single point 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