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                        Intersection Safety


            
            In This Section
        Intersection Safety
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                Safe System Intersections
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                Intersection Types
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   Related Links
          Alternative Intersection Video Playlist – includes DDI and DLT intersections
                                                        Diverging Diamond Interchange Informational Guide, Second Edition
                
                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 intersectionSource:MoDOT,FLKR,CC BY 2.0Outreach and Education Resources

Alternative Intersection Video Playlist– includes DDI and
	DLT intersectionsDiverging Diamond Interchanges

Diverging Diamond Interchange Brochure
	Diverging Diamond Interchange Case Studies
	I–44 at State Route 13, Springfield, MO
		I–15 at Main Street, American Fork, UT
		I–15 at State Route 92/Timpanogos Hwy, Lehi, UT
		Georgia's First Restricted Crossing U–Turn IntersectionsDisplaced Left–Turn Intersections

Displaced Left–Turn Intersection Brochure
	Displaced Left–Turn Case Studies
	State Route 30 at Summit Drive, Fenton, MO
		Bangerter Highway Corridor, Salt Lake County, UT
		Redwood Road at 6200 South, Taylorsville, UTTechnical Materials and Research

Diverging Diamond Interchanges

Diverging Diamond Interchange Informational Guide, Second Edition
	Performance of Alternative Diamond Interchange Forms
	Volume I: Research Report
		Volume II: Guidelines for Selecting Alternative Diamond Interchanges
	Exploring Corridor Operations in the Vicinity of a Diverging Diamond Interchange (DDI): Final Report
	Comprehensive Safety Assessment Methodology for Innovative Geometric DesignsDisplaced Left–Turn Intersections

Displaced Left–Turn Intersection Informational Guide
	Use of Innovative Intersection Designs for Improving Mobility and Reducing Roadway Traffic CongestionConnections to Other Transportation Safety Topics

The Federal Highway Administration's (FHWA) EDC–2 initiative for Intersection and Interchange Geometrics developed educational materials about DDIs, DLTs, and other intersection designs
	Roundabout, restricted crossing U–turn (RCUT), and median U–turn (MUT) intersection designs also offer improved safety due to fewer conflict points
	Intersection Control Evaluation (ICE) policies and tools can help agencies choose an optimal intersection design
	Low–cost strategies and countermeasures can improve safety. Learn more at Stop–Controlled Intersection Safety and Signalized Intersection Safety
              
      
    
          Last updated: Monday, August 23, 2021 U.S. DEPARTMENT OF TRANSPORTATION

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