Unlike a conventional interchange, the lanes in a DDI cross over to the left side of the roadway. That limits the number of traffic signal phases and allows drivers to make a left turn without crossing in front of oncoming traffic. The lanes then change back to the right side of the road. Central Florida’s first DDI opened at Interstate 95 (I-95) and Viera Boulevard in July 2019.

These innovative interchange configurations have been shown to improve safety, increase traffic efficiency, and be cost-effective.

The driver should proceed through the first traffic light, staying in the lane in which he or she is driving. The lane will guide the driver to the opposite side of the road. Before the lane crosses back to the right side of the road, the driver will encounter one more traffic signal.

If the driver wants to turn right onto a freeway ramp from the arterial road, the driver should use the right turn lane, just like in a conventional interchange.

When turning left onto a freeway ramp, the driver should stay in the left lane and follow the lane through the first traffic light on to the other side of the road. Then, before going through the second traffic light, the driver will turn left onto the freeway ramp.

Turning right onto the arterial road from a freeway ramp is as easy as taking a right turn at a conventional interchange. When turning right onto an arterial road, remember to yield to oncoming traffic and watch for pedestrians and bicyclists using marked walkways.

To turn left onto the arterial road, follow the left lane and, when traffic allows, take a left turn. The lanes will guide the driver from the left side of the road to the right side of the road, similar to going straight through the interchange.

Compared to walkways in conventional interchanges, pedestrian walkways are shorter in DDIs. When walking through a DDI, pedestrians should cross traffic on designated crosswalks to reach a median. They cross traffic again to reach the other side of the interchange.

Bicyclists traveling through a DDI can either stay in the bike lane or dismount and use pedestrian walkways.

Here are some things to keep in mind when approaching a DDI on a bicycle:

• Cyclists uncomfortable with riding through the DDI can walk their bike through the interchange on the pedestrian walkways as stated above.
• When riding alongside traffic, cyclists should remain in the bicycle lane by following the pavement markings.
• When automobile traffic shifts to the left side of the road, cyclists will be on the inside rather than the outside. The bike lane will shift back to the outside on the far side of the interchange when traffic returns to the right side of the roadway.

A new DDI configuration opened to motorists March 2024 at the interchange of Interstate 4 (I-4) and Sand Lake Road (State Road (S.R.) 482) and at the interchange of I-4 and County Road (C.R.) 532 near ChampionsGate in July 2022. An additional DDI is planned for the I-4 corridor as part of the I-4 Beyond the Ultimate. The DDI will be located at the I-4 interchange of Daryl Carter Parkway. Construction of the DDI at Daryl Carter Parkway began in November 2022 and is expected to be complete by summer 2025.