National Academies Press: OpenBook

Alternative Intersection Design and Selection (2020)

Chapter: List of Abbreviations

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Page 72
Suggested Citation:"List of Abbreviations." National Academies of Sciences, Engineering, and Medicine. 2020. Alternative Intersection Design and Selection. Washington, DC: The National Academies Press. doi: 10.17226/25812.
Page 72

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72 List of Abbreviations CAP-X Capacity Analysis for Planning of Junctions CDI Conventional Diamond Interchange CFI Continuous Flow Intersection CGT Continuous Green-T CLV Critical Lane Volume CMF Crash Modification Factor DCD Double Crossover Diamond DDI Diverging Diamond Interchange DLT Displaced Left-Turn Intersection EPG Engineering Policy Guide ICE Intersection Control Evaluation IDG Intersection Decision Guide LOS Level of Service MOT Maintenance of Traffic MUT Median U-Turn MUTCD Manual on Uniform Traffic Control Devices PARCLO Partial Cloverleaf Interchange QRI Quadrant Roadway Intersection RAID Roundabout and Alternative Intersection Design team RCI Reduced Conflict Intersection RCUT Restricted Crossing U-Turn RIRO Right-In/Right-Out SPDI Single Point Diamond Interchange SPUI Single Point Urban Interchange SPICE Safety Performance for Intersection Control Evaluation TDI Tight Diamond Interchange TWSC Two-Way Stop-Controlled VJuST VDOT Junction Screening Tool

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State departments of transportation often encounter public resistance to alternative intersections, with 86% of respondents in a new survey of state DOTs agreeing or strongly agreeing that public resistance hinders their implementation. Public resistance can vary among projects based on intersection type and whether the project was initiated at the local or state level.

The TRB National Cooperative Highway Research Program's NCHRP Synthesis 550: Alternative Intersection Design and Selection documents the evaluation and selection processes within state departments of transportation (DOTs) for intersection projects.

Roundabouts are the most widely implemented type of alternative intersection. Ninety percent of state DOTs that responded to the synthesis survey reported having at least one roundabout in their jurisdiction open and operational. Roundabouts also had the highest reported number of facilities in project development as 88% of respondents indicated there was at least one roundabout under development at their DOT.

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