Double crossover merging interchange
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Double Crossover Merging Interchange
Description
A Double Crossover Merging Interchange (DCMI) is a new type of interchange. The traffic lane patterns lane of the DCMI’s offers a system of creating a high volume interchange that allows traffic to continuously flow without the need for costly elevated “fly-over” roadway bridges, and uses less lane area and structures than an interchange with large radius fly-over(s). The DCMI employs several of the design techniques of a newer alternative interchange referred to as a Double Crossover Diamond.[1] or a Diverging diamond interchange. The Double Crossover Merging Interchange is also similar to a standard diamond interchange.
The Double Crossover Merging Interchange has several distinct design features that differentiate it from a Diverging Diamond Interchange. Utilizing a standard main bridge with two smaller underpass type bridges on either side of the main bridge, the Double Crossover Merging Interchange lets vehicles crossover conflicting traffic streams while removing weaving maneuvers. This configuration produces an interchange with merging maneuvers.[2]. By placing two smaller bridges (grade separation) on either side of the main bridge, the traffic signals can be eliminated. Additionally, the off-ramp traffic can be crossed over on the same smaller side bridges as the main bridge traffic patterns. Hence, this removes conflicts that would take place with an at-grade traffic signal. The key feature of this type of design is not only the elimination of the conflicts that occur at-grade, but also allows the off-ramp traffic crosses over without the need for lane changes or weaving within the interchange.
The Double Crossover Merging Interchange introduces a number of new mechanisms to a tight diamond type interchange while producing a free flow traffic environment interchange.
Advantages
- No Weaving Sections
- Provides Free-Flow Operations
- Reduced Vehicles Emissions (No Idling Vehicles)
- No Right-Angle Crossing Conflicts
- No Delay Incurred Due to Traffic Signals
- Less Costly to Construct than a Full Free Flow Interchange with Fly-Over Roadway Bridges
Disadvantages
- May be More Costly Than a Standard Diamond Interchange to construct
See also
- Diverging Diamond Interchange (DDI)
- Single Point Urban Interchange (SPUI)
- Standard Diamond Interchange
References
- ^ Alternative Intersections/Interchanges: Informational Report (AIIR), FHWA Publication.
- ^ http://www.DcmiInterchange.com Double Crossover Merging Interchange.