Continuous-flow intersection

A continuous flow intersection (CFI), also called a crossover displaced left-turn (XDL or DLT), is an alternative design for an at-grade road junction.

Motorists sometimes cite discomfort due to the speed differential, a known cause of accidents, though conflicts could be reduced through the provision of an adequate acceleration lane and merge area.

The Accokeek, MD CFI also has notable inequalities in traffic flow depending upon the direction of travel.

This type of intersection can require a significant amount of right-of-way to implement (dependent upon the configuration), which is why the technique is not frequently used in urban areas.

The redesign of the Redwood Road/6200 South intersection in Taylorsville, Utah cut emissions of carbon dioxide by 19 tons (17 tonnes) per year.

[9] Compared to the previous design, the redesign of the Bangerter Highway/3500 South intersection saves 3+1⁄2 minutes of travel time per vehicle and 800,000 U.S. gallons (3,000,000 liters) of fuel per year, and has 60% fewer accidents nearby; it also cost $20 million to $40 million less in construction costs than a grade-separated alternative.

Sample continuous-flow intersection with typical lane variation, turn restrictions, and traffic light position
A continuous flow intersection in West Valley City , Utah showing the layout and normal traffic flow in the southwest portion of the intersection.
Driving through a continuous flow intersection on Utah State Route 154 (Bangerter Highway) at 4100 South in summer 2013.
A continuous flow intersection between Maryland Route 210 and Maryland Route 228 in Accokeek, Maryland .
Sketch and traffic light sequence of a four-way intersection with displaced left turns on two of the legs.