Terminology used for bridge and highway infrastructure design.
The semi-directional "T" interchange is just like the Directional T interchange, except that it does not feature left exits. See Kurumi's Trumpet Interchanges for more.
Some interchanges utilize features of both a diamond and a cloverleaf interchange. These interchanges may feature one or more loop ramps in addition to diamond ramps. They might be used in cases where real estate for the interchange is limited or when there is significantly higher traffic volume in one direction over another. Types include the parclo A2, where the loop ramps form on-ramps, parclo B2 where the loop ramps [...]
A modified cloverleaf retains the same features as a regular cloverleaf interchange, except that the weaving process is lessened by the use of a collector distributor lane to reach the cloverleaf. The c/d lane carries much less traffic than the main lanes, so traffic impacts as a result of weaving are lessened as a result.
A draw bridge where the deck of the bridge lifts vertically in one segment, instead of at an angle in two segments. For the most part, lift bridges still only exist along railroad corridors and not along highways, but an example is the Heim Bridge along California 47 in Los Angeles.
A highway intersection that results in all turns from the right-hand side of the road. The intersection when viewed from above resembles a jughandle in that all left-hand turning traffic exits to the right and loops back to the main road in a perpendicular fashion. This configuration eliminates the need for left-hand turning lanes and signals. It also may be used to provide a sufficient turning radius for semi truck [...]
This is a diamond interchange where full roundabouts facilitate traffic movements at the ramp ends. The design appears to form a dumbbell when viewed from above.
A diamond interchange where the ramp ends at the intersecting road meet at incomplete roundabouts. Coupled with the connecting road, these roundabouts from above resemble the shape of a dog bone. This exchange differs only from dumbbell interchanges in that traffic cannot travel 360 degrees around the respective roundabouts.
A new type of interchange appearing throughout the United States starting in 2009 with the opening of the DDI between Interstate 44 and Missouri 13. This interchange sees the carriageways of an intersecting road switch sides above or below the parent freeway, removing the need to clear opposing traffic for all left-hand turn movements.
An interchange where two routes, generally expressways or freeways, come together with directional ramps forming the shape of a T when viewed from above.
This is the most basic interchange design, and it consists of four ramps (two off-ramps and two on-ramps). Diamond interchanges have a diamond shape when viewed from the air, hence the name. There are four ramps total in this configuration. Traffic exiting a freeway at a diamond interchange will see usually see a stop sign or traffic light to manage traffic leading onto the connecting road. More modern diamond interchanges [...]