Displaced Left-Turn Intersection : [techbrief]

Details

• Creators:
  Hughes, Warren E. ; Jagannathan, Ram
• Corporate Creators:
  United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
• Contributors:
  Bared, Joe G.
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center
• Subject/TRT Terms:
  Interchanges Intersections Left Turn Lanes
• Publication/ Report Number:
  FHWA-HRT-09-055
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  United States. Federal Highway Administration. Office of Research, Development, and Technology
• Abstract:
  Today's transportation professionals, with 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 corresponding technical report, Alternative Intersections/Interchanges: Informational Report (AIIR) (FHWA-HRT-09-060), covers four intersection designs and two interchange designs. These designs offer substantial advantages over conventional atgrade intersections and grade-separated diamond interchanges. The AIIR provides information on each alternative treatment and covers salient geometric design features, operational and safety issues, access management, costs, construction sequencing, and applicability. This TechBrief summarizes information on one alternative intersection design-the displaced left-turn (DLT) intersection (see figure 1). Within the figure, the red circles symbolize signal-controlled crossovers; the blue patterned circle represents a signal-controlled main intersection; the orange arrows indicate left-turn crossover movement; and the yellow arrows indicate opposing through movement at signal-controlled crossovers. Figure 1 is a partial DLT intersection where the DLT movements have been implemented on two opposing approaches of the major road. The crossroad left turns are treated identical to a conventional design.
  
  
• Content Notes:
  Distribution number: HRDS-05/10-09(3M)E
• Format:
  PDF
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:920260252d9a4612cc09dc1392a46332b727a11666e62024adb53e855ae3ce08ee3115bf05b5976ee451a52d4fc0a1aca875b1462051bc33c893fcacba9cb1c8
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/38836/dot_38836_DS1.pdf
• File Type:
  [PDF - 3.93 MB ]