Table of Contents
What is the purpose of a diamond interchange?
WHAT IS A DIVERGING DIAMOND INTERCHANGE? The Diverging Diamond Interchange (DDI) is a simple design innovation that improves safety and mobility, often at a much lower cost, compared to conventional interchange designs.
What is a full diamond interchange?
A full diamond interchange is formed when a one-way diagonal ramp is provided in each quadrant of the interchange. The ramps are aligned with free-flow from the main roadway and an intersection on the crossroad. Diamond interchanges have application in both rural and urban areas.
How much does a diamond interchange cost?
For a new interchange
| Interchange | Location | Alternative Design Cost |
|---|---|---|
| I-435 / Front Street | Kansas City, MO | Diamond $11.4 Million Single Point Urban Interchange (SPUI) $25 Million |
| SR-265 / SR-62 | Utica, IN | $118 Million |
| I-590 / Winton Road | Brighton, NY | SPUI $10 Million Triple Left Diamond $13.6 Million |
Are Diverging diamonds safer?
The study found that the DDI ramp terminals were safer than the conventional diamond signalized terminals. The DDI ramp terminals experienced 55% fewer fatal and injury crashes, 31.4% fewer property damage only crashes, and 37.5% fewer total crashes.
What is the easiest interchange to deal with?
The diamond interchange has two main uses. One is to replace a traffic signal intersection that is overloaded. The other is to provide needed access between Interstate highways and minor roads (since intersections are prohibited by law on Interstate highways). It is the easiest freeway-to-street interchange to build.
Who invented diverging diamond?
The double crossover diamond (DCD), or diverging diamond interchange (DDI), was first developed in France and brought to North America around 2002. It is the latest new interchange form developed in the past 30 years.
What is the biggest interchange in the world?
The Dallas–Fort Worth metroplex has several five-level stacks, most notably the High Five Interchange between US 75 and I-635; completed in 2005 and currently the tallest interchange in the world.
What are the safety benefits of diverging diamond interchanges?
Safety Benefits
- Fewer conflict points (14 for DDI, 26 for conventional)
- Conflict points spread out throughout interchange.
- Better sight distance at turns.
- Virtually no driver confusion (FHWA study and new DDI observations in Springfield, MO)
- Traffic calming features when desired.
What are diverging diamond interchanges?
Diverging diamond interchange. A diverging diamond interchange ( DDI ), also called a double crossover diamond interchange (DCD), is a type 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.
What is a double diamond intersection?
A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), is a type 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.
What is a double crossover diamond?
A diverging diamond interchange ( DDI ), also called a double crossover diamond interchange ( DCD ), is a type 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.
What is a Divergent Diamond?
The diverging diamond is a design that moves cars quickly across a freeway without building an expensive cloverleaf exchange, while at the same time providing accommodation to non-car transport.