Scientists at North Carolina State University say that, in the future, traffic flow should be handled on broad thoroughfares. A large-scale survey has shown that special “superstreets” without intersections produce a much better traffic flow, provide greater capacity and limit accidents.

Rather than waiting at a stoplight, drivers wishing to cross or make a left turn from a side street are first required to turn right onto the superstreet and then make a U-turn around a broad median — this method of turning is often referred to as a “Michigan left turn,” due to its frequent use in that state. The concept has been around throughout the United States for at least 20 years as well, but very few studies had examined the streets’ effectiveness.

The North Carolina State team assessed 13 superstreets across North Carolina, and found that they reduce travel time by 20 percent compared to conventional streets. The studies also demonstrated that superstreets reduce the number of collisions by 46 percent, and have 63 percent fewer accidents involving personal injuries.