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Three-level diamond diagram
A three-level diamond interchange is a type of highway interchange where through traffic on both main roads is grade-separated from intersections which handle transferring traffic. It is similar in design to a three-level stacked roundabout except for its use of (usually signalled) conventional intersections, and can be thought of as two diamond interchanges fused together.


In a three-level diamond interchange, the two main roads are on separate levels, and on a third level, usually in the middle, there is a square of one-way roads. The square circulates clockwise where traffic drives on the left, or anticlockwise where it drives on the right. At each corner of the square is the terminal of an exit ramp from one main road and an entrance ramp to the other main road. Traffic transferring from one road to the other to make an overall right turn only passes through one corner of the square, at which point a right turn is made. Transfer traffic making an overall left turn must proceed straight through the first intersection it encounters, turn left at the next, and then proceed straight through a third intersection to enter the other main roadway.


Three-level diamond interchanges are most common in urban settings where the right-of-way for a new interchange must be kept to a minimum.

Location First Route Second Route Notes
Cedar Rapidsmarker, Iowamarker I-380 IA 100 Collector/distributor roads intersect.
Sioux Citymarker, Iowamarker I-29 US 77
Detroitmarker, Michiganmarker I-75 (Walter P. Chrysler Freeway) M-102 (8-Mile Road) I-75 uses frontage roads.
Detroitmarker, Michiganmarker M-102 (8-Mile Road) M-1 (Woodward Avenue)
Detroitmarker, Michiganmarker M-102 (8-Mile Road) M-10 (John C. Lodge Freeway) Includes flyovers from northbound M-10 to westbound M-102, eastbound M-102 to southbound M-10, and westbound M-102 to northbound M-10. M-10 uses frontage roads.
Jefferson Citymarker, Missourimarker US 50/US 63 northbound US 54/US 63 southbound A flyover ramp allows southbound US 63 traffic to join US 50 east, bypassing one intersection.
Ashevillemarker, North Carolinamarker I-240 I-240 Exit 7
Springfield Townshipmarker, Pennsylvaniamarker I-476 US 1
Fairfax County, Virginiamarker Fairfax County Parkway US 29 The south end of West Ox Road also meets this interchange.
Welchmarker, West Virginiamarker US 52 (King Coal Highway) US 121 (Coalfields Expressway) As of 2008, grading has been completed for interchange but interchange itself has not been constructed.
Wheelingmarker, West Virginiamarker I-470 US 250/WV 2 Entire interchange is elevated above city streets.
Wauwatosamarker, Wisconsinmarker US 45 WI 190 (Capitol Drive) An access road for the adjacent Harley-Davidson plant is also part of the interchange.

A few examples of this can also be found in Texas; however, the interchanges usually include the frontage roads as well. If the traffic amounts increase the interchange is usually converted into a stack interchange.


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