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 |
What is a highway 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.
Are diverging diamond interchanges 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 benefit of a diverging diamond interchange?
A diverging diamond interchange allows two directions of traffic to temporarily cross to the left side of the road. It moves high volumes of traffic through an intersection without increasing the number of lanes and traffic signals. This movement provides easier access to an interstate.
How many diamond interchanges are there?
DDIs are proliferating because they’re safer than a traditional four-way intersection. Where two, two-lane roadways intersect, drivers have 32 separate opportunities to collide into each other. In a DDI, there are only 14.
Does diverging diamond help traffic?
It’s not often that you can make traffic flow more smoothly and safely without spending significant time and money. Fans of the new highway interchange design say it improves traffic flow by eliminating problematic left turns. There’s just one catch: It briefly sends all cars over to the left side of the road.
Why are diverging diamonds better?
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. Drivers make right turns at a DDI just as they would at a regular diamond interchange.
Does diverging diamond help traffic flow?
A new study has provided evidence that an innovative type of road structure called a diverging diamond interchange (DDI) can help to improve traffic flow and minimize the risk of collisions occurring.
