Interchanges are complex intersections between two or more roads involving connector ramps. The main roadways in interchanges are usually grade-separated (use of overpasses), though some unusual examples include at-grade intersections where there usually are grade separations.
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- Kurumi's Field Guide to Interchanges Descriptions and diagrams of many types.
- An VRML rendering of the 15-91 interchange, Corona California. A 4-level stack with one loop. Requires a VRML plugin to view.
- Museum of Dumb Highway Design Aerial photos of and commentary on various interchanges which the author finds unusual or substandard.
- Michigan Left Turn Describes how this unusual intersection feature works, including history.
- Unusual Interchanges Diagrams and commentary of various ones in the East-Central U.S.
- WhereRoadsMeet Includes aerial photographs and descriptions of unusual or complicated facilities in the United States.
- US Highway Interchange Browser Covers Michigan and North Carolina.