The National Academies Press

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From page 91... ... A-1 A P P E N D I X A Characteristics of Recurrent and Non-Recurrent Congestion This appendix provides a data-driven foundation to understand and characterize the range of operational conditions that drive congestion patterns, corridor performance, and integrated management response. First, the guidance establishes the motivation for Integrated Corridor Management (ICM) Read the entire page →
From page 92... ... A-2 Broadening Integrated Corridor Management Stakeholders of four or more actual days, and the total size of the box representing the condition reflects its frequency of occurrence. In 2017, FHWA released a key document related to the systematic identification of operational conditions -- developed and authored by Cambridge Systematics Team members. Read the entire page →
From page 93... ... Characteristics of Recurrent and Non-Recurrent Congestion A-3 Department of Transportation (WSDOT) .1 Using speed data, WSDOT has archived a system-wide congestion map on 10-minute intervals since January 2013. Read the entire page →
From page 94... ... A-4 Broadening Integrated Corridor Management Stakeholders FIGURE A.3. Comparison of change in delays (Cambridge Systematics) Read the entire page →
From page 95... ... Characteristics of Recurrent and Non-Recurrent Congestion A-5 FIGURE A.4. Reliability measures are related to average congestion measures (USDOT) Read the entire page →
From page 96... ... A-6 Broadening Integrated Corridor Management Stakeholders FIGURE A.5. Top multi-vehicle incident locations by route (KC Scout) Read the entire page →
From page 97... ... Characteristics of Recurrent and Non-Recurrent Congestion A-7 FIGURE A.7. Accident rates by location (Cambridge Systematics) Read the entire page →
From page 98... ... A-8 Broadening Integrated Corridor Management Stakeholders FIGURE A.8. Definition of transportation performance management (USDOT) Read the entire page →
From page 99... ... Characteristics of Recurrent and Non-Recurrent Congestion A-9 Demonstrate the ability of improvement strategies to improve mobility, throughput, and travel reliability based on current and future conditions. Help prioritize individual investments or investment packages within the study area. Read the entire page →
From page 100... ... A-10 Broadening Integrated Corridor Management Stakeholders Data Requirements The precise data requirements for calculating performance measures will vary depending on the performance measure; however, they all require basic inputs, including: Roadway geometry. Traffic control data. Read the entire page →
From page 101... ... Characteristics of Recurrent and Non-Recurrent Congestion A-11 Operational Conditions -- If there are Variable Message Signs (VMS) in the study area, the type of information that is displayed, the location, and if possible, the actual messages that were displayed are needed. Read the entire page →
From page 102... ... A-12 Broadening Integrated Corridor Management Stakeholders Depending on the mean to standard deviation ratio and the desired margin of error, the required sample size may vary greatly. Analysis and Evaluation Methods This section includes a discussion of several common methods for evaluating the extent, severity, and/or impact of recurrent and non-recurrent congestion, along with methods for analyzing their causes. Read the entire page →
From page 103... ... Characteristics of Recurrent and Non-Recurrent Congestion A-13 of operations that are unworkable or uncover opportunities that may be leveraged that result in changes to the ultimate ICM design. The Value of Integrated Corridor Management Analysis Investing in ICM analysis is a major undertaking that requires stakeholders to agree to the value proposition. Read the entire page →
From page 104... ... A-14 Broadening Integrated Corridor Management Stakeholders The Integrated Corridor Management Analysis Process FIGURE A.9 presents the five major work steps, summarized below, associated with implementing the Integrated Corridor Management (ICM) Analysis, Modeling, and Simulation (AMS) Read the entire page →
From page 105... ... Characteristics of Recurrent and Non-Recurrent Congestion A-15 communicate the project vision to the broader stakeholders effectively. It also helps maintain agreement and project continuity as stakeholders leave positions and new staff comes in mid-stream. Read the entire page →

From page 91...

... A-1 A P P E N D I X A Characteristics of Recurrent and Non-Recurrent Congestion This appendix provides a data-driven foundation to understand and characterize the range of operational conditions that drive congestion patterns, corridor performance, and integrated management response. First, the guidance establishes the motivation for Integrated Corridor Management (ICM)