Users' questions

What is a diverging diamond traffic pattern?

What is a diverging diamond traffic pattern?

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.

Why are diverging diamonds good?

Like the continuous flow intersection, the diverging diamond interchange allows for two-phase operation at all signalized intersections within the interchange. Additionally, the design can improve the efficiency of an interchange, as the lost time for various phases in the cycle can be redistributed as green time.

Are Diverging diamonds helping with 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.

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.

Does diverging diamond help traffic flow?

Are Diverging diamonds safer?

Who invented the diverging diamond interchange?

The diverging diamond appears to have been invented in the early 1970s in France, where only three were completed. The first one in the United States was built by the Missouri Department of Transportation at a busy interchange in Springfield in 2009.

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. Because of this, it comes with a learning curve for many drivers.

Who designed the diverging diamond?

Chlewicki, the “father of the diverging diamond interchange,” created it for a term paper at the University of Maryland in 2000. The first was built in Springfield, Mo., in 2009. “Every state that has put one in is trying to put more in,” Chlewicki said.

Do diverging diamond interchanges work?

Ultimately, a diverging diamond interchange configuration is not a “silver bullet” that should be used everywhere, but if designed and constructed in the right circumstances, it can be successful in relieving congestion and improving driver safety.

How do diverging diamonds work?

A diverging diamond interchange temporarily crosses traffic to the opposite side of the road. Instead of driving on the right side of the road like we’re used to, one crosses over via signalized intersections and travels on the left side of the road temporarily as you go through the interchange.