DDIs eliminate left turns across traffic, reducing the number of “conflict points” or areas where vehicles can collide from 18 to 8.
A conflict point is where road users cross paths as they travel through or turn from one route to another. Conflict points are always present at interchanges. Limiting the number of conflict points at an interchange not only reduces the frequency and severity of crashes, but also improves the overall operation and mobility.
This interchange removes the need for left turn signals which allows for longer green lights and smoother flow of traffic through the interchange.
Diverging Diamond Interchanges are designed to be intuitive to drive through. Traffic signals guide the way, and advanced signage and pavement markings will be in place to help motorists navigate through the interchange. All motorists need to do is follow their lane!
To drive straight through a Diverging Diamond, motorists simply proceed through the first traffic light, maintaining their lane. The lane will guide drivers to the opposite side of the road, as illustrated in the image below.
Compared to conventional interchanges, Diverging Diamonds have shorter pedestrian walkways. When walking through a DDI, pedestrians should cross traffic on designated walkways to reach a median. Bicyclists have the option to use walkways or travel through a bike lane.