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    <title>Research in Progress (RIP)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Research in Progress (RIP)</title>
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    <item>
      <title>Towards Resilient V2X Communications over 5G/6G Networks: Sensing and Cooperative Perception</title>
      <link>https://rip.trb.org/View/2329756</link>
      <description><![CDATA[Enabling mission critical communication for vehicular networks can be achieved by exploiting 5G and 6G wireless systems. However, given that such systems are primarily designed with high rate services in mind (e.g., multimedia), ensuring continuous availability of the communication link for V2X communication is a major challenge.

The goal of the first year of this project is to explore the use of resilience as a metric for guaranteeing the operation of V2X links under different dynamics of the environment. This will create a seed for the next year of this project that can exploit the developed fundamentals to investigate other avenues like integrated sensing and communications.

(1) Resilient Communications Fundamentals: 5G and 6G networks may rely on high-frequency bands to provide high-speed wireless access for V2X. High-frequency bands can potentially be intermittent due to factors such as blockage and fading. This susceptibility to signal blockage and low signal-to-interference ratio is also a challenge at low frequency bands. While 3GPP has advocated for providing ultra-reliable wireless communications for 5G mission-critical systems, this design, centered on reliability – which requires continuous availability of a communication link – has proven to be difficult to achieve in the real world due to the challenges of the wireless channel. In contrast, it may be more apropos to design resilient communication links that can quickly recover from failures (unintentional or intentional). This includes failures due to cybersecurity breaches. Despite significant research in this space in fields such as cyber-physical systems, to date, the very definition of resilience in cellular networks, in general, and V2X networks, in particular remains ambiguous.

In this research task, the research team will explore for the first time the fundamentals of resilience for wireless networks, in general, and connected autonomy systems (V2X or drones), in particular. The research team will develop new metrics for resilience and analyze the performance achievable by a wireless systems in terms of those new metrics, while contrasting them to classical standardization metrics like reliability.

(2) Optimization of resilience in V2X systems: Once metrics are defined, the next step is to optimize the overall operation of the system to enhance resilience under various intentional and non-intentional failures, including cybersecurity threats like jamming. In particular, the goal here will be to study how to design the cross-layer communication mechanisms, from beamforming to network resource management in a way to meet the resilience needs of V2X systems, as quantified in the first task. This task will potentially explore machine learning (ML) techniques to deal with complex optimization problems, and to ensure adaptation of the system to large-scale dynamics.]]></description>
      <pubDate>Wed, 31 Jan 2024 15:11:16 GMT</pubDate>
      <guid>https://rip.trb.org/View/2329756</guid>
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    <item>
      <title>Synthesis of Information Related to Transit Practices. Topic SA-61. State of Practice for Transit Recovery in the Aftermath of Severe Weather Events</title>
      <link>https://rip.trb.org/View/2301577</link>
      <description><![CDATA[

Severe weather events impact transit agency operations, equipment, and infrastructure. In recent decades, billions of dollars of transit assets have been destroyed by climate-related disasters. This has resulted in millions of passengers being deprived of reliable transit service. TCRP Web-Only Document 70: Improving the Resilience of Transit Systems Threatened by Natural Disasters, Volume 1: A Guide (2017) offered practices for transit systems of all sizes to absorb the impacts of disaster, recover quickly, and return rapidly to providing the services that customers rely on to meet their travel needs. While transit agencies have policies to address disruptive events and severe weather, many remain without formal emergency plans.

This synthesis documents the current state of practice around transit recovery plans. The synthesis identifies how often transit agencies have recovery plans, what is included in recovery plans, the timing of recovery, measurements of recovery success, and how agencies finance recovery. This report begins with a literature review synthesizing interdependencies of recovery, guidelines and resources for recovery, the recovery plans, and financing recovery. Then, a survey is discussed that was administered to 24 bus-only agencies to develop a better understanding of recovery plans at bus transportation agencies. In-depth case examples are then presented of five of the agencies to provide an overview of the agency recovery plan, typical recovery time, recovery approaches, local/community coordination, and any funding received for recovery. Lessons the agencies learned from their recovery experiences are then discussed. The report concludes with identifying recovery planning benefits, contents, community, funding, and resilience and then identifying eight areas for future research.

Patricia Bye and Deborah Matherly collected and synthesized the information and wrote the report, under the guidance of a panel of experts in the subject area. The members of the topic panel are acknowledged on page iv. This synthesis is an immediately useful document that records the practices that were acceptable within the limitations of the knowledge available at the time of its preparation. As progress in research and practice continues, new knowledge will be added to that now at hand.
]]></description>
      <pubDate>Tue, 05 Dec 2023 09:39:48 GMT</pubDate>
      <guid>https://rip.trb.org/View/2301577</guid>
    </item>
    <item>
      <title>Integration of Contingency Planning for Small Airports</title>
      <link>https://rip.trb.org/View/1872915</link>
      <description><![CDATA[Recent events, such as the COVID-19 pandemic, have shown how small airports (general aviation (GA), non-hub, and small-hub commercial service), which have limited resources and expertise, are often ill-prepared to address airport disruptions. Airport disruptions are situations that impact staffing, financial and information technology (IT) resources, infrastructure, facilities, and supply chain shortages.  
Specifically, these airports have challenges with effective coordination and integration of contingency planning (operational and business continuity, emergency response, financial sustainability and resiliency). Research is needed to help small airports benefit by integrating all aspects of contingency planning to sustain operations and build resiliency.    
The objective of this research is to develop guidance to assist small airports to effectively integrate plans for operational and business continuity, emergency response, financial sustainability, and resiliency to respond to airport disruptions. 
Considerations for development of the guidance should include at a minimum:  
(1) Identification of existing and available reports and resources that would assist in development of a reference library;  
(2) A sampling of case studies at a variety of relevant types and sizes of small airports and other industry entities (e.g., rail, highways, ports, utilities) that reflect best practices of integration; 
(3) Identification or development of tools (e.g., flow charts, checklists, decision trees) that will assist in the integration;
(4) Flexibility for integration with respect to event complexity, airport size, and its resources (internal and external); and
(5) A process for conducting a cost benefit analysis of integration. ]]></description>
      <pubDate>Wed, 18 Aug 2021 09:27:26 GMT</pubDate>
      <guid>https://rip.trb.org/View/1872915</guid>
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    <item>
      <title>Resiliency of Transportation Corridors during Disaster: An Examination of Cross-Border Networks</title>
      <link>https://rip.trb.org/View/1230205</link>
      <description><![CDATA[Transportation corridors are vital in allowing for public and commercial mobility. When these corridors are compromised during a disaster, the way in which emergency response networks function is critical to ensuring continuity or resumption of the transportation flow. This project expands upon ongoing research that examines how multi-organizational actors/agencies expect and are expected to interact during a transportation corridor disaster. The initial study concentrated on organizational networks within the state of Delaware, while also collecting information on their potential interaction with organizations in other states. This proposed research concentrates on those connections with organizations from outside Delaware. Using social network analysis, researchers will examine the codified and actor-anticipated interaction between states in maintaining the continuity of transportation flows along the I-95 corridor in Delaware.]]></description>
      <pubDate>Thu, 03 Jan 2013 13:56:01 GMT</pubDate>
      <guid>https://rip.trb.org/View/1230205</guid>
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