Design

A Michigan Left is a type of intersection where motorists make a series of right or U-turns instead of a normal left-hand turn. The design eliminates left turns at congested intersections to help speed along through-traffic. They are named after Michigan, because it was the first state to implement them. The Utah Department of Transportation (UDOT) refers to their version as a "ThrU Turn Intersection," or TTI for short.

Invented in Mexico by civil engineer Francisco Mier, the continuous flow intersection or CFI was developed as a lower cost transportation solution for congested intersections. The design both costs less than conventional interchanges or SPUI's and requires less right of way. The CFI reduces construction time and requires minimal closures to existing facilities to build. The CFI separates traffic turning left from a highway mainline at a crossover signal a [...]

A partial interchange where two roads come together in the shape of a "Y", with a single on-ramp in one direction and off-ramp in the other. These are generally located where one route splits with another and where reverse access is counter intuitive or accomplished by another connection.

A trumpet interchange is designed to provide for all movements when a freeway or expressway ends at another freeway or expressway. It generally incorporates one loop ramp, two high-speed diamond ramps, and one bridge. When viewed from above, the interchange resembles the musical instrument. See Kurumi's Trumpet Interchanges for more.

A high speed interchange joining two routes where ramps come together as a series of three-wye interchanges. This varies from a Directional-T interchange in that the two routes intersecting do not do so at a 90 degree angle.

A swing bridge is a bridge that can be moved either clockwise or counterclockwise to allow for ship traffic pass by without any overhead obstructions. There are few of these left along vehicular roads, but several remain along railroad lines.

A suspension bridge is a bridge with its deck supported by large cables hung from towers, such as the U.S. 101 / Golden Gate Bridge or the George Washington Bridge along Interstate 95 across the Hudson River.

Another name for a multi-level interchange where high-speed flyovers cross over one another or another bridge. These ramps may have one or more lanes, and the flyovers may rise over each other to an impressive height. Stack interchanges are generally found in where freeways were built later in less developed areas, where ample right of way was available. California, Arizona and Texas are home to numerous stack interchanges. See Kurumi's [...]

A single-point urban interchange (also known as an urban diamond interchange) is a variant on the standard diamond interchange, whereby all traffic meets at one single traffic signal in the center of the bridge over the freeway (or underneath the freeway). These interchanges can accommodate more traffic in smaller spaces, but require a larger, more expensive bridge structure. For more, see Kurumi's Single-Point Urban Interchanges.