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    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
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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>Delineation of Linear Roadside Hardware Systems and Roadside Obstacles</title>
      <link>https://trid.trb.org/View/2682135</link>
      <description><![CDATA[This report provides information on the practices for delineating linear roadside hardware systems and roadside obstacles, including their descriptions, effectiveness, and appropriate applications. This information was developed from (1) a review and evaluation of current practices relevant to the delineation of linear roadside hardware systems and roadside obstacles, (2) an analysis of crash data and the effectiveness of delineation practices in reducing crash severity or crash frequency, and (3) a human factors study evaluating the effectiveness of several roadside hardware and roadside obstacle delineation practices. The information contained in this report will help highway agencies and other organizations concerned with safety aspects on highways make informed decisions regarding the delineation of roadside hardware and obstacles to reduce crashes and improve safety.]]></description>
      <pubDate>Sun, 22 Mar 2026 17:18:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2682135</guid>
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      <title>Successful Approaches to Integrating Artificial Intelligence (AI) Into Knowledge Management</title>
      <link>https://trid.trb.org/View/2681237</link>
      <description><![CDATA[As state Departments of Transportation (DOTs) and other transportation agencies expand their knowledge management (KM) programs, interest in incorporating artificial intelligence (AI) is increasing. Agencies are exploring how AI-enabled tools can support knowledge capture, organization, retrieval, and application.

This scan will examine current practices used by state DOTs and other organizations to implement AI in knowledge management. It will identify opportunities as well as common challenges, including data quality, security, governance, and ethical considerations. Careful and responsible integration of AI is essential to ensure effective and sustainable use within KM programs.]]></description>
      <pubDate>Tue, 17 Mar 2026 15:12:12 GMT</pubDate>
      <guid>https://trid.trb.org/View/2681237</guid>
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      <title>Successful Strategies in Providing Training Programs for State and Local Equipment Technicians</title>
      <link>https://trid.trb.org/View/2681233</link>
      <description><![CDATA[Fleet managers across surface transportation agencies face ongoing challenges in identifying training needs for fleet maintenance technicians and delivering effective programs. Prior to 2020, many states relied heavily on vendor-led training to support technician development on new and existing equipment. Following the COVID-19 pandemic, a number of vendors reduced or discontinued these offerings, requiring agencies to pursue alternative approaches.

As fleet equipment continues to incorporate more advanced technologies, the need for consistent, high-quality, and up-to-date technical training has become increasingly critical to maintaining safe, reliable, and cost-effective operations.

OBJECTIVE: This scan will examine organizations that have successfully identified and implemented sustainable training programs for fleet maintenance technicians. The team will document how agencies structure and manage their programs, measure effectiveness, and ensure appropriate leadership support.]]></description>
      <pubDate>Tue, 17 Mar 2026 15:03:19 GMT</pubDate>
      <guid>https://trid.trb.org/View/2681233</guid>
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    <item>
      <title>Edge AI-Enhanced Traffic Monitoring and Anomaly Detection Using Multimodal Large Language Models</title>
      <link>https://trid.trb.org/View/2562213</link>
      <description><![CDATA[This paper addresses the challenge of traffic monitoring and incident detection in remote areas, utilizing multimodal large language models (LLMs) deployed on edge AI devices. The key novelty of the LLM is to convert real-time video streams into descriptive texts, enabling low-bandwidth transmissions and reliable detection of anomalies and incidents in environments of intermittent connectivity. The model is developed based on fine-tuning open-source LLMs and extending it with multi-modal capabilities to analyze video frames. Our work also involves deploying this model on edge devices such as Nvidia IGX Orin and is planned to be tested in realistic environments in future work. The methodology includes data set curation, iterative model fine-tuning and compression, and hardware-based optimization. This approach aims to enhance traffic safety and response speed in remote areas, marking a significant advancement in the application of AI for traffic monitoring and safety management.]]></description>
      <pubDate>Fri, 20 Feb 2026 15:28:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2562213</guid>
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    <item>
      <title>Study on Traffic Organization of Compound Interchanges on Composite Expressways</title>
      <link>https://trid.trb.org/View/2613040</link>
      <description><![CDATA[An elevated composite expressway intersecting with an ordinary road forms a new type of interchange. When two of these new interchanges are located close to each other, an elevated compound interchange emerges. Evaluating traffic organization for such interchanges is a crucial issue. This research proposed a comprehensive evaluation system for traffic organization. Both qualitative and quantitative analyses were employed to compare six strategies of traffic organization and identify the optimal one. Traffic simulation software Simulation of Urban Mobility (SUMO) was utilized to model the traffic scenarios, integrated with Python through the Traffic Control Interface (TraCI) to obtain the number of conflicts at key merging and diverging sections, using an improved Time-to-Collision (TTC) model. Finally, through cluster analysis and fuzzy evaluation, the optimal traffic organization was determined. The research results establish a system for evaluating traffic organizations in compound interchanges, providing theoretical support for roadway design.]]></description>
      <pubDate>Fri, 20 Feb 2026 15:28:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/2613040</guid>
    </item>
    <item>
      <title>Pavement Surface Properties Consortium Phase IV - Improving Safety and Saving Lives through Pavement Surface Optimization</title>
      <link>https://trid.trb.org/View/2672598</link>
      <description><![CDATA[Functional pavement considerations are fundamental to the performance and management of pavements. In addition to structural and durability requirements, an optimum pavement wearing surface should provide a combination of a good riding quality, adequate safety, and a low noise level. All these responses are highly influenced by the various components of the pavement surface texture. Previous phases of the program demonstrated that a collaborative research program can provide an accessible and efficient way for highway agencies and other organizations to conduct research on pavement surface properties. The collaboration helped the participating agencies explore new technologies, verify the operation and accuracy of the equipment currently used for evaluating pavement surface properties, and enhance the methodologies for developing and implementing proactive friction management programs.
OBJECTIVE: The mission of the Surface Properties Consortium has been to conduct applied research focused on enhancing the level of service provided by the roadway transportation system by optimizing pavement surface characteristics.]]></description>
      <pubDate>Thu, 19 Feb 2026 18:59:56 GMT</pubDate>
      <guid>https://trid.trb.org/View/2672598</guid>
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    <item>
      <title>From Road Traffic to Road Safety: The Paradigm Shift To Save Lives</title>
      <link>https://trid.trb.org/View/2576301</link>
      <description><![CDATA[Research, theories, and practices regarding road safety have developed over time. From being an issue between the driver and the police, it evolved with Vision Zero towards demands on the infrastructure, the vehicle manufacturers, and now the organizations that employ drivers or buy transport services. The 3rd Ministerial Conference on Road Safety shone a light on the link between the Safe System principles and occupational health and safety. At the 4th Ministerial Conference on Road Safety in Morocco in 2025, FIA (Federation Internationale de l’Automobile) plans to present the first major companies certified within the FIA Road Safety Index.]]></description>
      <pubDate>Wed, 18 Feb 2026 11:59:29 GMT</pubDate>
      <guid>https://trid.trb.org/View/2576301</guid>
    </item>
    <item>
      <title>Safe System U.S. Leadership: The Pivot, the Progress, and the Work Ahead</title>
      <link>https://trid.trb.org/View/2666566</link>
      <description><![CDATA[January 7, 2025, the Institute of Transportation Engineers (ITE) hosted a roundtable at the Transportation Research Board (TRB) Annual Meeting in Washington, DC, to discuss the current status and future of Safe System leadership in the United States. A select panel of U.S. Safe System leaders reflected on progress in the integration of Safe System principles into practice to date and discussed strategies for sustaining and advancing this momentum. Attendees represented key organizations from federal and local governments, engineering, planning, public health, advocacy, and academia. The broader roundtable discussion delved into how to institutionalize the Safe System Approach: identifying pathways for continued progress and determining who should take the lead in advancing these efforts. This article summarizes key insights from the panel and the discussion, with particular reflection on the recent 10th anniversary of the earliest Vision Zero policy adoption in the United States and the recent publication of the ITE Safety Roadmap and Action Plan.]]></description>
      <pubDate>Tue, 17 Feb 2026 13:11:25 GMT</pubDate>
      <guid>https://trid.trb.org/View/2666566</guid>
    </item>
    <item>
      <title>State DOT Training Programs Used to Comply with NPDES Stormwater Permit Requirements</title>
      <link>https://trid.trb.org/View/2669177</link>
      <description><![CDATA[The Clean Water Act requires state departments of transportation (DOTs) to comply with the National Pollutant Discharge Elimination System (NPDES). In most cases, the federal government delegates NPDES permitting and training authority to state environmental protection agencies, resulting in varying requirements across the country. NCHRP Synthesis 660: State DOT Training Programs Used to Comply with NPDES Stormwater Permit Requirements highlights the diverse approaches DOTs use to deliver stormwater training. These approaches include in-house programs, partnerships with universities and private organizations, certification processes, and innovative formats such as field-based instruction and virtual training. The report also identifies several research gaps, including opportunities to strengthen public engagement, standardize certification mechanisms, and explore best practices for collaborative training models involving universities and other stakeholders.]]></description>
      <pubDate>Thu, 12 Feb 2026 15:29:13 GMT</pubDate>
      <guid>https://trid.trb.org/View/2669177</guid>
    </item>
    <item>
      <title>Assessing Safety Effectiveness of Treatments and Technologies at Highway-Rail Grade Crossings</title>
      <link>https://trid.trb.org/View/2666565</link>
      <description><![CDATA[This report provides information on the safety effectiveness of treatments and technologies at highway-rail grade crossings and presents a rational approach for evaluating this effectiveness, while considering different levels of data availability. The information contained in this report will help highway agencies and other organizations concerned with safety aspects at highway-rail grade crossings in making informed decisions regarding the deployment of treatments and technologies at such crossings to reduce incidents and improve safety.]]></description>
      <pubDate>Sat, 07 Feb 2026 12:17:08 GMT</pubDate>
      <guid>https://trid.trb.org/View/2666565</guid>
    </item>
    <item>
      <title>Designing Safer Streets</title>
      <link>https://trid.trb.org/View/2662686</link>
      <description><![CDATA[Designing Safer Streets is an implementation strategy in which the transportation network is planned, designed, built, operated, and maintained to enable safe mobility within the transportation system. The pooled fund will be established to conduct research on innovative strategies to design and implement a safe streets.  

OBJECTIVES: To assemble a consortium composed of State Departments of Transportation; County, regional, local, or tribal transportation agencies; additional interested entities or organizations; and Federal Highway Administration (FHWA) program offices to meet national needs in support of safer streets. Activities of the consortium include: Identify planning, roadway design, human factors, safety, and operational issues related to safe streets elements and projects; Select new and existing safe Streets elements and/or projects for evaluation; Initiate and monitor research projects; Disseminate results; and Facilitate collaboration and information sharing among members.]]></description>
      <pubDate>Thu, 29 Jan 2026 16:30:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2662686</guid>
    </item>
    <item>
      <title>Bridge Steel Coatings Tolerant of Minimal Surface Preparation</title>
      <link>https://trid.trb.org/View/2633876</link>
      <description><![CDATA[In 1993 and 1994, the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA) initiated regulations that radically altered practices in the paint industry. Many of these measures apply to lead abatement, practices devised to eradicate lead-based paint hazards. These changes in legislation are designed to promote domestic, worker and environmental safety. The organizations that must implement these changes are finding that complying with the new rules are complicated and extremely expensive. The Oklahoma Department of Transportation (ODOT) selected seven bridges to overcoat with coating systems that meet the new standards for evaluation. The systems selected require minimal surface preparation, that is, removal of loose debris and dirt instead of the removal of an existing paint system on the steel beams, prior to application. Research, Development and Technology Transfer of ODOT monitored the application of several different paints to these bridges. An eighth bridge was cleaned using an abrasive cleaning method then coated with a lead-based paint that no longer meets the new regulations; this will be the control bridge for this study. This construction report presents the observations and application procedures of these coating systems to the above-mentioned bridges with emphasis on compatibility testing, SSPC SP2, SSPC SP3 and SSPC SP6 standard cleaning methods, construction procedures, and cost analysis.]]></description>
      <pubDate>Sat, 03 Jan 2026 10:54:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2633876</guid>
    </item>
    <item>
      <title>A Statewide Highway System Network Analysis: Impact of Probe Vehicle Composition</title>
      <link>https://trid.trb.org/View/2631662</link>
      <description><![CDATA[The U.S. Congress has mandated that the National Performance Management Research Data Set (NPMRDS) be used by federal and state transport agencies and metropolitan planning organizations for performance analyses. The NPMRDS contains archived space mean speed (SMS) from probe vehicles representing Trucks, Passenger Vehicles, and All-Traffic for every 5-min time period of each day across predefined roadway links in the United States. This paper analyzes approximately 41 million SMS estimates from 4,385 spatial segments disaggregated at 5-min intervals on Alabama highways for all days in October 2023. There was strong evidence found that the NPMRDS SMS estimates for All-Traffic were biased toward Truck SMS estimates. The authors subsequently developed a statistically valid approach for removing the oversampling bias. It was found that the maximum mean average percentage difference between the proposed approach and the uncorrected All-Traffic SMS was approximately 25%. To improve the accuracy of traffic metrics that depend on the NPMRDS, it is recommended that users should consider the proposed correction method if their NPMRDS data show similar oversampling bias. It is also recommended that the NPMRDS should explicitly define how the All-Traffic SMS data were estimated and provide the actual number of probes or sample size instead of a quasi-representation of actual probes.]]></description>
      <pubDate>Tue, 02 Dec 2025 09:56:42 GMT</pubDate>
      <guid>https://trid.trb.org/View/2631662</guid>
    </item>
    <item>
      <title>The Texas Congestion Index: Concept and Methodology</title>
      <link>https://trid.trb.org/View/2582671</link>
      <description><![CDATA[The metropolitan transportation organizations in the eight largest metro regions of Texas and the Texas Department of Transportation jointly developed a process to investigate the congestion resulting from a range of investment levels. Part of this process, the Texas Metropolitan Mobility Plan, was the development of a set of performance measures. The measures are based on calculations from the long-range planning model output data. The same procedures used in air quality analyses are applied to congestion estimates. The measures are based on travel time information and comparisons with free-flow travel speeds. The Texas Congestion Index is a comparison of the travel condition during the peak period to the travel time in free flow. The procedures provide a method to estimate benefits from a range of operational treatments to provide a more robust set of performance measures. A set of spreadsheets and training materials are also available.]]></description>
      <pubDate>Sun, 30 Nov 2025 16:39:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582671</guid>
    </item>
    <item>
      <title>Guidebook for Mobility Monitoring: In Small to Medium-Sized Communities</title>
      <link>https://trid.trb.org/View/2582253</link>
      <description><![CDATA[The primary objective of Texas Department of Transportation (TxDOT) research from which this guidebook was generated was to develop and test a framework for mobility monitoring in small to medium-sized communities (SMSCs). This guidebook provides a user-friendly step-by-step process for public- and private-sector transportation professionals to implement a mobility monitoring program in their communities. A companion document located in a pocket at the back of this guidebook serves as a reference for nontechnical audiences. This guidebook, and the companion documents produced by this research effort, will be useful for state DOT staff in SMSCs as well as state DOT partnering agencies, including metropolitan planning organizations (MPOs), municipalities, and counties.]]></description>
      <pubDate>Sat, 22 Nov 2025 17:17:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582253</guid>
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