High Quality Content by WIKIPEDIA articles! Continuous flow intersection (CFI), also called a crossover displaced left-turn (XDL), is an at-grade intersection that moves the turning vehicles, conflicting with the through-movements (to the left where traffic drives on the right, and vice-versa), out of the main intersection. A CFI moves the left turn down the road several hundred feet, eliminating the left-turn traffic signal phase. A fly-over designed CFI (non-at-grade) was a previously patented design invented by Francisco Mier, of Mexico. Over 40 have been implemented over the past decade. As the design was patented, agencies previously had to pay to obtain the rights for use of the design; however, the patent has expired in the United States. This general configuration has appeared in different versions in various places, with the implementation of channelization in the United States since the 1950s, such as the Telegraph Road section of U.S. Route 24 in Michigan.