Superstreet
superstreet.png 
​The Superstreet design is similar to the Median U-turn Crossover concept but features a break in cross-street traffic that allows the signals on opposite directions of the arterial to operate independently. Left turns from the arterial can make direct left turns onto the cross-street but cross-street thru and left turn movements must use the directional U-turn crossovers.
 
References
Maryland Arterial Intersection Design
The Superstreet design is similar to the Median U-turn Crossover concept but features a break in cross-street traffic that allows the signals on opposite directions of the arterial to operate independently.
Maryland Arterial Intersection Design

FHWA Signalized Intersections Guide
This report complements the American Association of State Highway and Transportation Officials' (AASHTO) Strategic Highway Safety Plan to develop guidance on safety of nonsignalized and signalized intersections. The goal is to reduce the annual number of highway deaths. This guide a comprehensive document that contains methods for evaluating the safety and operations of signalized intersections and tools to remedy deficiencies.
FHWA Signalized Intersections Guide

North Carolina Project Superstreet Alternative
Currently, there are large amounts of traffic on U.S. 15/501 passing through the intersection of Erwin Road/Europa Drive. The combined factors of heavy traffic flow on U.S. 15/501 and the current traffic flow to/from businesses in the area have raised concerns for motorists and pedestrian safety. The constant congestion results in multiple back-ups and long delays in traffic movement; moreover, constant idling results in higher vehicle emissions.
North Carolina Project Superstreet Alternative

Iowa State Presentation
The J-Turn intersection utilizes a directional median opening which closes the median to minor road traffic, but still allows all maneuvers (including left-turns) from the expressway.
J-Turn 101.pdfJ-Turn 101.pdf

Median Intersection Design for Rural High-Speed Divided Highways
The purpose of this study was to explore common safety issues, discuss alternative safety improvements at rural intersections and to report experiential data collected from agencies who have tried alternative methods. The report contains 10 case studies showing how different alternatives have been used in the field. 
Median Intersection Design for Rural High-Speed Divided Highways​