Maryland State Highway Administration Traffic Safety and Operations

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Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park

Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park Unconventional Arterial Intersection Design University of Maryland Advanced Transportation Day Aug. 28 th 2014

Unconventional Arterial Intersection Design (UAID) Rerouting Reducing conflict points Reduced delay Reducing Signal Phases

Unconventional Arterial Intersection Design (UAID) Rerouting Reducing conflict points Reduced delay Reducing Signal Phases Increased capacity Emphasizing critical movements Improved safety Splitting the intersection plane Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park

Roundabout Unsignalized Superstreet Unsignalized Median U-Turn Roundabout Median U-Turn Unsignalized Superstreet Unsignalized Median U-Turn

Roundabout Unsignalized Superstreet Unsignalized Median U-Turn Roundabout Median U-Turn Unsignalized Superstreet Unsignalized Median U-Turn At Grade & Unsignalized At Grade & Signalized Windmill Interchange Grade. Separated & Unsignalized Grade. Separated & Signalized Single Roundabout Interchange Single. Windmill Roundabout Interchange Double Roundabout Interchange Superstreet Median U-turn Continuous Flow Echelon Diverging Diamond Double Roundabout Center Turn Overpass Interchange Maryland State Highway Administration Echelon Diverging Interchange Center. Diamond Turn Overpass Traffic Safety and Operations Lab University of Maryland, College Park

Superstreet • MD 3 & Waugh Chapel Rd. , Odenton • Through and left-turn

Superstreet • MD 3 & Waugh Chapel Rd. , Odenton • Through and left-turn traffic from the minor road need take a U-turn. • Decreased arterial delay Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park

Diverging Diamond Interchange (DDI) • MD 295 & Arundel Mills Blvd. , Hanover (half

Diverging Diamond Interchange (DDI) • MD 295 & Arundel Mills Blvd. , Hanover (half DDI) • Through traffic is on the left side for a short section and then crosses back. • Shorter off-ramp queues Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park

Continuous Flow Intersection (CFI) • MD 210 & MD 288, Accokeek • The first

Continuous Flow Intersection (CFI) • MD 210 & MD 288, Accokeek • The first CFI on a U. S. state highway. • Left-turns begin several hundred feet ahead of the main intersection. • Increased capacity at the main intersection Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park

Multi-stage analysis process Planning Evaluation Signal Optimization Operation Analysis • Estimated delay • Queue

Multi-stage analysis process Planning Evaluation Signal Optimization Operation Analysis • Estimated delay • Queue length • Green splits • Offsets • Accurate delay • Level of service Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park

MUID Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College

MUID Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park

MUID Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College

MUID Maryland State Highway Administration Traffic Safety and Operations Lab University of Maryland, College Park

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