Design Guide for Addressing Nonrecurrent Congestion (2014) / Chapter Skim
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11 This chapter introduces a variety of treatments that may be applicable to reducing nonrecurrent congestion on freeways. The treatments presented in this guide are primarily geared toward freeway facilities.
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12 DESIGN GUIDE FOR ADDRESSING NONRECURRENT CONGESTION TABLE 2.1. DESIGN TREATMENTS Nonrecurrent Congestion Design Treatments Secondary Treatments Medians Emergency crossovers Movable traffic barriers Gated median barrier Movable cable median barrier Extra-height median barrier Mountable/traversable medians Shoulders Accessible shoulders Drivable shoulders Alternating shoulders Portable incident screens Vehicle turnouts Bus turnouts Crash Investigation Sites Crash investigation sites Right-of-Way Edge Emergency access between interchanges Arterials and Ramps Ramp widening Ramp closure Ramp terminal traffic control Ramp turn restrictions Detours Improvements to detour routes Truck Incident Design Considerations Runaway truck ramp Construction Reduced construction duration Improved worksite access and circulation Animal–Vehicle Collision Design Considerations Wildlife fencing, overpasses, and underpasses Weather Snow fences Blowing sand mitigation Anti-icing systems Lane Types and Uses Contraflow lanes for emergency evacuation Contraflow lanes for work zones High-occupancy vehicle and high-occupancy toll lanes Dual facilities Reversible lanes Work-zone express lanes Traffic Signals and Traffic Control Traffic signal preemption Queue-jump and bypass lanes Traffic signal improvements Signal timing systems Ramp metering and flow signals Temporary traffic signals Variable speed limits and speed limit reduction Technology Electronic toll collection Overheight vehicle detection and warning systems Emergency Response Notification Reference location signs Roadside call boxes Weather Fog detection systems Road weather information systems Flood warning systems Wind warning systems The decision trees are provided to give the user a starting point for using the SHRP 2 Project L07 treatment evaluation tool.
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13 DESIGN GUIDE FOR ADDRESSING NONRECURRENT CONGESTION of the treatments listed may not be appropriate for certain freeway segments. For example, alternating shoulders would not be a candidate treatment on a segment that already has full left and right shoulders available.
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14 DESIGN GUIDE FOR ADDRESSING NONRECURRENT CONGESTION Fi g u re 2 .1 .
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15 DESIGN GUIDE FOR ADDRESSING NONRECURRENT CONGESTION Fi g u re 2 .2 .
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16 DESIGN GUIDE FOR ADDRESSING NONRECURRENT CONGESTION EVALUATING AND COMPARING TREATMENTS Ideally, users will identify two to five treatments from the decision tree shown in Figure 2.1 to evaluate and compare in the SHRP 2 Project L07 treatment Analysis Tool. The tool is applied to a specific segment of roadway on which nonrecurrent congestion occurs and compares the benefits and costs of the selected treatments as applied to that particular segment of roadway.
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