Active Traffic Management Strategies A Planning and Evaluation Guide (2024) / Chapter Skim
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1 Setting the Stage for Active Traffic Management
1 Setting the Stage for Active Traffic Management
Pages 1-26
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Today, most agencies have detection levels and operational appropriate path forward capabilities that would have been unimaginable 30 years with active traffic ago, and these capabilities can be leveraged for a wide management strategies variety of approaches to improve mobility and safety. However, changing travel patterns, growing demand, suited to their regional needs changing traveler behaviors, limited resources, and and characteristics.
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Agencies need beneficial information and guidelines related to ATM in all areas and levels of transportation planning as well as resources that directly link the transportation planning and programming process with operations. The intent is to help agencies assess which operational strategies they might include in regional transportation planning that have the potential to provide the most benefit to the regional transportation network.
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The Intended Audiences The intended audiences for this guide include planning, design, and operations practitioners primarily involved in implementing and operating active traffic management strategies on freeways and arterial streets. Specific agencies include, but are not limited to, federal, state, and local planning and implementing agencies; metropolitan planning organizations (MPOs)
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PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Figure 1-1. Guide organization (Source: Texas A&M Transportation Institute [TTI]
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As shown in Figure 1-2, ATDM also contains active demand management (ADM) and active parking management (APM)
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. This focus is synergistic with the directive of past federal legislation for agencies to meet the performance management goals for federal highway programs, including safety, congestion reduction, system reliability, freight movement and economic vitality, and environmental sustainability (FHWA 2012a)
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. The active management cycle represents the fundamental concept of taking a dynamic approach The active management cycle involves to a performance-based process.
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Using technology, ATDM manages traffic flow and influences traveler behavior in real time to achieve agency-identified operational objectives. Components of ATDM ATDM incorporates three major categories of strategies to impact the trip chain: active demand management, active traffic management, and active parking management.
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usage SoCal 511 Trip Planner Predictive traveler Predictive travel times using historical Los Angeles, CA information, data to inform pre-trip travel decisions comparative multimodal travel times I-85 Express Lanes Dynamic pricing and Dynamic pricing of HOT lanes and Atlanta, GA incentives incentives for transit and HOV usage COTA//Plus On-demand transit and Mobile application with no fare for Columbus, OH incentives connection to bus stop Share the Ride NC Dynamic ridesharing, Mobile application with single trip North Carolina regional incentives matching for one-time trips APM APM is the dynamic management of parking facilities to optimize the use of those facilities while influencing travel behavior (FHWA 2012c)
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When various ATM strategies are implemented in combination, they can work to fully optimize the existing infrastructure and provide measurable benefits to the transportation network and the motoring public. One of the benefits of these new systems is that they allow for the dynamic or realtime automated operation of traffic management strategies that more quickly respond to changing conditions as they occur.
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General information related to ATM is also included on the FHWA ATDM website (FHWA 2023c)
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. Additional detail on the specific characteristics of each stage for various ATM strategies is included in Chapter 2 -- Active Traffic Management Strategies.
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This allows agencies and operators to respond in real-time to changing traffic conditions and incidents on the road, which further increases safety and reduces congestion. ATM and TSMO ATM, and by association ATDM, with its active management approach is a component of the overall concept of TSMO.
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ATM and ICM Active management factors can be incorporated into the integrated corridor management (ICM) concept, as shown in Figure 1-7.
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For example, adaptive traffic signal control clearly applies to surface streets as does transit signal priority. However, both can also be critical components of an ICM deployment that addresses the relationship between managing the freeway and adjacent arterial facilities in concert using several ATM strategies.
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Primary benefits can be described as those that directly affect the performance of the multimodal application, such as reducing travel times, reducing intersection delay, increasing travel time reliability, and increasing travel speeds. Secondary benefits can be categorized as those that are attributed to safety, such as reduced crash rates and severity, and reduced secondary crash incidents.
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Potential Benefits Active Traffic Management Strategy Adaptive Traffic Signal Control Separate Lane/Bypass Lane Dynamic Lane Use Control Dynamic Junction Control Adaptive Ramp Metering Part-Time Shoulder Use Dynamic Lane Reversal Variable Speed Limits Transit Signal Priority P: Primary Multimodal Benefit S: Secondary Multimodal Benefit Delayed onset of main lane breakdown S S Reduced main lane travel delay P P Reduced arterial travel delay S Reduced travel delay P P Reduced ramp delay as freeway demands subside P P Reduced ramp delay P Reduced vehicle-hours traveled P P S Reduced crash rate S S S S S Reduced secondary crashes S Reduced crash severity S S Reduced rear-end crashes where warning is in effect Reduced arterial travel time P P Reduced travel time P P P P P Reduced queue length S S Reduced number of stops Reduced intersection delay P P Reduced speed differential P Reduced speed variability P Reduced spatial extent of congestion S Reduced temporal extent of congestion S Improved arterial travel time reliability P Increased travel time reliability P P Increased arterial speed Increased travel speed P Increased throughput during lane reversal operations P Increased capacity when used with dynamic shoulder P use Increased lane-level volume S Increased on-time arrival S P P S P P S Improved level of service (LOS) S Improved LOS when shoulders are in operation P Improved responder safety P Improved compliance with posted signage during S different flow conditions PRE-PUBLICATION DRAFT -- Unedited Text and Graphics
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Effective ATM operations can optimize the use of available safety by increasing driver resources, such as roadway capacity and transit awareness of congested conditions, services, to better accommodate the traveling public. This approach can reduce travel times, alleviate promoting more uniform speeds, congestion, and minimize the likelihood of incidents and temporarily modifying caused by frustrated or aggressive drivers.
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greenhouse gas emissions through the use of more efficient transportation modes and optimizing traffic flow to minimize idling and stop-and-go traffic. This optimization can help reduce air pollution and contribute to a healthier environment.
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options, cities can reduce the transportation burden on vulnerable populations and ensure that everyone has equal access to economic and educational opportunities. Additionally, better transportation operations can reduce the negative impact of transportation on communities.
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The titles of each chapter/ appendix and the major topics covered include the following: • Chapter 1 -- Setting the Stage for ATM: An overview of the document, an introduction to ATM and its context within the overall transportation framework, and a quick guide to the topics covered in the individual chapters are provided in this chapter. • Chapter 2 -- Active Traffic Management Strategies: An overview of ATM is the focus of this chapter, which includes concepts and topics related to the various ATM strategies, domestic and international experiences with ATM, and lessons learned.
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• Appendix B -- ATM Strategy Fact Sheets: This appendix includes a collection of fact sheets for each of the ATM strategies included in the guide. PRE-PUBLICATION DRAFT -- Unedited Text and Graphics
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. Active Management Cycle Guide.
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. ATDM Program Brief: Active Traffic Management.
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. The Second Strategic Highway Research Program (SHRP 2 -- 2006–2015)
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PRE-PUBLICATION DRAFT -- Unedited Text and Graphics PRE-PUBLICATION DRAFT -- Unedited Text and Graphics
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