Today's transportation professionals, with the limited resources available to them, are challenged to meet the mobility needs of an increasing population. At many highway junctions, congestion continues to worsen, and drivers, pedestrians and bicyclists experience increasing delays and heightened exposure to risk. Today's traffic volumes and travel demands often lead to safety problems that are too complex for conventional intersection designs to properly handle. Consequently, more engineers are considering various innovative treatments as they seek solutions to these complex problems.
The Alternative Intersections/Interchanges: Informational Report covers four intersection and two interchange designs that offer substantial advantages over conventional at-grade intersections and grade-separated diamond interchanges. It also provides information on each alternative treatment covering salient geometric design features, operational and safety issues, access management, costs, construction sequencing, environmental benefits and applicability. The four alternative intersection treatments covered in this report are displaced left-turn (DLT), restricted crossing U-turn (RCUT), median U-turn (MUT) and quadrant roadway (QR) intersections. In addition the two alternative interchange designs include double crossover diamond (DCD) and DLT interchanges. The report and corresponding Tech Briefs can be found on the Web as follows:
Alternative Intersections/Interchanges: Informational Report (AIIR)
Double Crossover Diamond Interchange (Tech Brief)
Displaced Left-Turn Intersection (Tech Brief)
Displaced Left-Turn Interchange (Tech Brief)
Median U-Turn Intersection (Tech Brief)
Quadrant Roadway Intersection (Tech Brief)
Restricted Crossing U-Turn Intersection (Tech Brief)
Mr. Lincoln Cobb and Mr. Ed Stollof for contributing these references. |
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