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FHWA Highway Safety Programs

Crossover Intersections

Some intersection designs direct some or all traffic to cross over to the left–hand side of the roadway to facilitate unopposed left–turn movements. These designs can improve safety and reduce congestion at the intersection.

The two most common crossover–based designs are the diverging diamond interchange (DDI) and the displaced left–turn (DLT) Intersection.

image of crossover intersection
Source:MoDOT,FLKR,CC BY 2.0

Outreach and Education Resources

Diverging Diamond Interchanges

Displaced Left–Turn Intersections

Technical Materials and Research

Diverging Diamond Interchanges

Displaced Left–Turn Intersections

Connections to Other Transportation Safety Topics