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    <title>Transport Research International Documentation (TRID)</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>Transport Research International Documentation (TRID)</title>
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    <item>
      <title>Caltrans Traffic Operations Data Standards Implementation Recommendations</title>
      <link>https://trid.trb.org/View/2696133</link>
      <description><![CDATA[This report investigates the evolving landscape of data standards within the transportation ecosystem, emphasizing their critical role in enabling interoperability, safety, and innovation across Intelligent Transportation Systems (ITS). The report outlines a strategic approach for advancing transportation data interoperability, emphasizing the need for implementation guidance to complement evolving standards. Effective interoperability requires five key components: robust data curation, discoverability, identity management, data exchange, and analytics. The private sector has a vital role to play—competing in analytics and user-facing applications—while resisting vendor lock-in that hampers long term integration. Emerging standards for Connected Work Zones (CWZ) represent a critical near-term opportunity, with Caltrans positioned to lead by modernizing its Lane Closure System (LCS), engaging stakeholders, and aligning business processes with data needs. The report concludes with actionable next steps for Caltrans, including developing data ontologies, piloting CWZ-compliant workflows, and investing in open, scalable infrastructure to support a safer, more connected transportation ecosystem.]]></description>
      <pubDate>Thu, 21 May 2026 09:09:42 GMT</pubDate>
      <guid>https://trid.trb.org/View/2696133</guid>
    </item>
    <item>
      <title>Mobile Electric Vehicle DCFC Infrastructure Deployment Opportunities</title>
      <link>https://trid.trb.org/View/2696128</link>
      <description><![CDATA[California Department of Transportation (Caltrans) is transitioning its vehicle fleet to electric vehicles (EVs) but currently faces challenges due to inadequate charging infrastructure. These infrastructure gaps cause operational delays, reduced fleet efficiency, and increased operational risks. To address these issues, Caltrans requires reliable mobile and semi-permanent direct current fast charging (DCFC) EV charging solutions. This study evaluates two charging systems, the EVESCO EVES-6060-NA and FreeWire Boost Charger 200, to determine their suitability for addressing Caltrans' specific operational challenges, compatibility concerns, and performance expectations.]]></description>
      <pubDate>Tue, 05 May 2026 10:19:54 GMT</pubDate>
      <guid>https://trid.trb.org/View/2696128</guid>
    </item>
    <item>
      <title>Determination of Recovery Bridge Corridors by Comparing Post EQ Network</title>
      <link>https://trid.trb.org/View/2696131</link>
      <description><![CDATA[This study focuses on Caltrans District 4 in the San Francisco Bay Area (Alameda, Contra Costa, Marin, Napa, San Francisco, Santa Clara, San Mateo, Solano, and Sonoma). It proposes a framework to identify and prioritize critical bridge corridors that enable access to emergency facilities, including hospitals, fire stations, police stations, Caltrans maintenance facilities, airports, seaports, and ferry terminals. Bridges are first grouped into corridors using an interchange-based approach. Next, a shortest-path algorithm is applied to find routes from each zip-based zone to its nearest facility of each type. Corridor “usage” is computed from how frequently corridors appear on these access routes, and total usage is used to rank corridor criticality. Bridges within top corridors are then evaluated and ranked using damage probabilities. The proposed method is validated against Google Maps, showing 5.6% route dissimilarity, indicating that access to critical facilities strongly depends on Caltrans routes. Corridor importance varies by facility type because facility distributions differ. For example, District 4 contains 563 fire stations across 298 zones, so most zones access a fire station locally and only 31 zones require Caltrans bridges, whereas 159 zones require Caltrans bridges to reach hospitals. The study also compares corridor rankings with and without population weighting. Without population, top corridors often occur in rural areas that serve as sole connectors for multiple zones; adding population shifts priorities toward densely populated areas, highlighting the need to define planning objectives. An updated methodology is proposed to remove selected corridors and recomputes rankings to test impacts, showing rural corridors are often irreplaceable while urban networks are highly redundant. Finally, another optimization method is introduced to minimize the number of Caltrans bridges used, trading off travel time to reduce recovery designations and costs. A web-based platform implements and visualizes these methods.]]></description>
      <pubDate>Mon, 04 May 2026 11:19:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2696131</guid>
    </item>
    <item>
      <title>Caltrans Field Trials of the Intelligent Truck-Mounted Attenuator (ITMA)</title>
      <link>https://trid.trb.org/View/2696136</link>
      <description><![CDATA[Truck-mounted attenuator (TMA) operators are exposed to traffic-related hazards during Caltrans maintenance operations. To help reduce this exposure, the Advanced Highway Maintenance and Construction Technology Research Center (AHMCT), in partnership with Caltrans, conducted controlled public-road field trials of the Intelligent Truck-Mounted Attenuator (ITMA). The ITMA is a two-vehicle system in which a leader vehicle guides a semi- or fully intelligent follower vehicle equipped with a TMA. Building on prior closed-course evaluations, this project prepared the system for field evaluation through hardware upgrades, communications improvements, interface enhancements, and operator training. The ITMA was evaluated during striping, sweeping, and raised pavement marker operations in both semi-intelligent and fully intelligent modes. Field trials demonstrated consistent following behavior, predictable emergency stopping, and stable performance in varied roadway and GPS-challenged environments. Operator feedback indicated positive acceptance and increasing familiarity with system operation. The results support the continued evaluation of the ITMA and inform future decisions regarding its potential operational use.]]></description>
      <pubDate>Mon, 04 May 2026 11:19:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2696136</guid>
    </item>
    <item>
      <title>Balanced Asphalt Mix Design: Eight Tasks for Implementation</title>
      <link>https://trid.trb.org/View/2691552</link>
      <description><![CDATA[Balanced Mix Design (BMD) is described as an “asphalt mix design using performance tests on appropriately conditioned specimens that address multiple modes of distress taking into consideration mix aging, traffic, climate, and location within the pavement structure.” Goals for implementation of BMD may differ among State Departments of Transportation (DOTs). Initially, some may wish only to add performance tests as part of mix design approval, whereas others may want to replace many existing criteria with new performance test criteria for mix design approval as well as for quality assurance (QA). To learn more regarding the details of BMD and implementation efforts, the Federal Highway Administration (FHWA) conducted virtual site visits between April and September 2020 and interviews of seven early adopter State DOTs, along with material producers, consultants and paving contractors that serviced the agencies. The participating State DOTs were California DOT (Caltrans); Illinois DOT (IDOT); Louisiana DOT and Development (LaDOTD); Maine DOT (MaineDOT); New Jersey DOT (NJDOT); Texas DOT (TxDOT); and Virginia DOT (VDOT). Successful practices documented from these virtual site visits were collected and synthesized into an overall process of implementing BMD as part of mix design approval and QA. This effort suggested eight major tasks based on concurrent activities (e.g., BMD regional workshops, BMD implementation guide).]]></description>
      <pubDate>Mon, 20 Apr 2026 09:22:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/2691552</guid>
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    <item>
      <title>Development and Testing of an Unmanned Aerial System (UAS) Cellular &amp; Wi Fi Repeater: Phase 2</title>
      <link>https://trid.trb.org/View/2668508</link>
      <description><![CDATA[California Department of Transportation (Caltrans) has many rural use cases where no current network communications exist outside of satellite services. Based on prior research from the Advanced Highway Maintenance and Construction Technology (AHMCT) Research Center, the cellular range of typical sites in rural areas is significantly limited by surrounding terrain and foliage. There is a need to provide enhanced communications availability outside of current cellular offerings without full-fledged investment in satellite equipment. Research performed under Phase 1 of Task 3280, showed that an Uncrewed Aerial Systems (UAS) can elevate a payload into the cellular signal that is typically blocked by terrain and create a Wi-Fi network on the ground for worker communications. Refinement of the UAS payload was necessary to minimize deployment time and reduce the number of components required to establish a usable network. After the payload package was optimized, field trials were conducted situations with limited to no cellular network coverage. With a temporary Wi-Fi network in construction and emergency response areas, communication can now occur through emails and Wi-Fi calling, increasing efficiency, resource management, and accurate equipment deployment for the first time in some rural districts. The purpose of this document is to provide the results from the field trials, analyze the performance of the UAS aerial repeater system, and provide recommendations.]]></description>
      <pubDate>Mon, 23 Feb 2026 11:19:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/2668508</guid>
    </item>
    <item>
      <title>Evaluation of Advanced Security Systems for Caltrans Equipment Yards/Maintenance Stations</title>
      <link>https://trid.trb.org/View/2668491</link>
      <description><![CDATA[The Advanced Highway Maintenance and Construction Technology (AHMCT) Research Center surveyed the security landscape (mobile robot security guards, video analytics security) to determine the current state of the art, and identify a system suited to DOE's security situation. The researchers provided information to the project panel supporting lease or purchase of an appropriately sized security system targeted for one yard. The panel opted to pilot test the camera-based system from Omniflow. The researchers procured the Omniflow system, along with construction and installation services from Metro Electric, while organizing the integration to the Marysville equipment yard. The Omniflow security system was deployed to capture security footage and provide live surveillance. The researchers developed a pilot test plan to evaluate key features, including ease of installation and deployment, system optimization by the vendor, power storage and management, video surveillance operation in various conditions (bright sun, night, fog, rain), video transmission, video analytics, autonomous capabilities, remote system monitoring, and maintainability. However, researchers did not have the opportunity to test the system as of the release date of this report.]]></description>
      <pubDate>Mon, 23 Feb 2026 11:19:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/2668491</guid>
    </item>
    <item>
      <title>New Near-Fault Adjustment Factors for Caltrans Seismic Design Criteria (SDC)</title>
      <link>https://trid.trb.org/View/2668488</link>
      <description><![CDATA[This report covers analyses of Caltrans’ near-fault adjustment factors as recommended in the Caltrans Seismic Design Criteria. The report has two large chapters. Chapter 1 builds on prior the University of California Los Angeles studies that performed probabilistic seismic hazard analyses at numerous California sites across a range of return periods and multiple site classes. Using that dataset, the chapter develops simplified, distance- and period-dependent models that quantify directivity amplification of elastic response spectra statewide. Because many bridges are expected to respond inelastically during major earthquakes, the models are further adapted to capture period elongation consistent with typical bridge ductility demands. In Chapter 2, the impacts of the near-fault directivity factors proposed in Chapter 1 were evaluated on the seismic performance of two Caltrans ordinary long-span bridge configurations: a single-column bent and a two-column bent. Using nonlinear time history analysis (NTHA), three-dimensional bridge models were evaluated under 20 bidirectional near-fault ground motions, scaled to three different target spectra. Analyses were performed for return periods of 1000 and 2475 years at two sites, Los Angeles and Oakland, and included an investigation of the influence of ground-motion directionality on bridge responses. Finally, the results obtained from elastic and inelastic analyses of single-degree-of-freedom systems, and NTHA were compared.]]></description>
      <pubDate>Mon, 23 Feb 2026 11:19:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/2668488</guid>
    </item>
    <item>
      <title>Development of a Liquefaction Hazard Screening Tool for Caltrans Bridge Sites</title>
      <link>https://trid.trb.org/View/2263859</link>
      <description><![CDATA[We have developed a liquefaction hazard screening tool for the California Department of Transportation (Caltrans) that is being used to evaluate the liquefaction hazard to approximately 13,000 bridge sites in California. Because of the large number of bridge sites to be evaluated, we developed a tool that makes use of parameters not typically considered in site-specific liquefaction investigations. We assessed geologic, topographic, seismic hazard, and subsurface conditions at about 100 sites of past liquefaction in California. Among the parameters we found common to many of these sites are: (a) low elevations, (b) proximity to a water body, and (c) presence of geologically youthful deposits or artificial fill materials. The nature of the study necessitated the use of readily available data, preferably datasets that are consistent across the state. The screening tool we provided to Caltrans makes use of the following parameters: (1) proximity to a water body, (2) whether the bridge crosses a water body, (3) the age of site geologic materials and the environment in which the materials were deposited, as discerned from available digital geologic maps, (4) probabilistic shaking estimates, (5) the site elevation, (6) information from available liquefaction hazard maps [covering the 9-county San Francisco Bay Area and Ventura County] and California Geological Survey (CGS) Zones of Required Investigation. For bridge sites at which subsurface boring data were available (from CGS' existing database), we calculated Displacement Potential Index values using a methodology developed by Allison Faris and Jiaer Wu. Caltrans' staff will use this hazard-screening tool, along with other tools focused on bridges and foundations, to prioritize site-specific investigations.]]></description>
      <pubDate>Mon, 09 Feb 2026 08:39:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2263859</guid>
    </item>
    <item>
      <title>Use of Soil-Cement Piles for Bridge Support</title>
      <link>https://trid.trb.org/View/2164664</link>
      <description><![CDATA[This paper presents the experience gained by the California Department of Transportation on the use of soil-cement piling techniques for the support of a bridge widening structure in San Francisco, California. Four pre-production soil-cement piles, installed using a soil-cement jetting system, were tested in compression and tension. One of the piles was fully instrumented with strain gauges and tell-tales. The tests revealed that high side resistance measured in dense sands is caused primarily by irregularities in the soil-cement pile surface. Tests also indicate that post-grouting of soil-cement piles represents an effective remedial alternative to mitigate non-compliant piles.]]></description>
      <pubDate>Fri, 06 Feb 2026 13:53:32 GMT</pubDate>
      <guid>https://trid.trb.org/View/2164664</guid>
    </item>
    <item>
      <title>Safety Effects of Yellow Alert on Changeable Message Signs: A Survey Study</title>
      <link>https://trid.trb.org/View/2580245</link>
      <description><![CDATA[The Yellow Alert program was proposed by the California Department of Transportation to establish a system designed to coordinate public alerts following a major injury or fatality producing hit-and-run collision. Sufficient vehicle information would be displayed on a changeable message sign (CMS) to either avert further harm or accelerate apprehension of the suspect. There are safety concerns with posting this “Alert”, which may distract drivers if they look for the suspected vehicle or change driving behaviors to examine surrounding vehicles. No prior studies have examined this topic. Therefore, the research team at University of California at Berkeley proposed a systematic human-factors study, aiming to evaluate the safety effects of Yellow Alert. The second phase of this study, the online survey, is reported here. A total of 1132 valid responses were collected from a sample of California drivers. Results of the survey indicate that most drivers could understand the Yellow Alert message. Potentially about 10% of the drivers would take extra actions to retain the information on the Yellow Alert message.]]></description>
      <pubDate>Thu, 29 Jan 2026 17:02:25 GMT</pubDate>
      <guid>https://trid.trb.org/View/2580245</guid>
    </item>
    <item>
      <title>Reconnecting Communities: Recommendations for Caltrans Excess Land</title>
      <link>https://trid.trb.org/View/2657013</link>
      <description><![CDATA[What changes to policies and procedures at the California Department of Transportation (Caltrans) would increase transfers of agency-owned excess land to California Native American Tribes and groups negatively impacted by freeway development? Using case studies on LandBack and reparations and qualitative research with Caltrans staff and community advisory groups, the research team developed recommendations for Caltrans’ excess land process, community performance measures, an overview of relevant policies, and examples of land return around the state.]]></description>
      <pubDate>Wed, 28 Jan 2026 14:42:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/2657013</guid>
    </item>
    <item>
      <title>Matrix-based long-term traffic flow prediction</title>
      <link>https://trid.trb.org/View/2606560</link>
      <description><![CDATA[Accurate long-term traffic prediction is crucial for enhancing traffic efficiency, ensuring urban safety, and fostering sustainable urban development. However, forecasting over extended periods is challenging due to intricate trends, cyclical variations, and interference from outlier data. To address these issues, this study proposes a matrix-based traffic flow prediction model. The model constructs a matrix with periods as rows and similarities as columns, leveraging periodicity and similarity in traffic data. A row-column prediction module links these patterns efficiently, while a fluctuation transformation mitigates the impact of outliers, significantly improving forecast accuracy. Extending the forecast time span to 14 days with hourly intervals, the model was validated using the PeMS dataset provided by the California Department of Transportation. Results demonstrate the model’s effectiveness in capturing complex temporal dynamics, providing a robust tool for long-term traffic prediction.]]></description>
      <pubDate>Mon, 22 Dec 2025 16:07:15 GMT</pubDate>
      <guid>https://trid.trb.org/View/2606560</guid>
    </item>
    <item>
      <title>Connecting with Community: Using Women’s History for Library Outreach [video]</title>
      <link>https://trid.trb.org/View/2636036</link>
      <description><![CDATA[Kendra Stoll, a Senior Librarian with the California Department of Transportation (Caltrans), presented tips on developing library outreach at this Transportation Librarians Roundtable. Stoll shared background information about a Caltrans employee affinity group called WOMEN (Women’s Opportunity to Mentor, Empower, and Network). For Women’s History Month in March, Stoll developed a presentation that covered the history of women in Caltrans. Women were involved in important work of the department from the beginning of Caltrans. Stoll shares lessons learned during the process of delivering the presentation, the reaction from attendees, and the benefits of organizing a presentation for library outreach.]]></description>
      <pubDate>Mon, 22 Dec 2025 09:52:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/2636036</guid>
    </item>
    <item>
      <title>Integration of Thermal Infrared (IR) Imaging into the Caltrans Inspection Program for Pavements and Bridge Decks</title>
      <link>https://trid.trb.org/View/2611038</link>
      <description><![CDATA[The California Department of Transportation (Caltrans) must inspect pavement and bridge decks to support proactive infrastructure maintenance. By leveraging non-destructive evaluation technologies for sensing and data processing, Caltrans would improve the speed and efficiency of this critical duty. The Strategic Highway Research Program recognized the utility of Thermal IR for early identification of shallow-seated deterioration in pavements and bridge decks. Early detection allows for repair and rehabilitation ahead of significant degradation, saving time and money on maintenance. Caltrans has installed a thermal infrared (IR) system on its 3D Ground-Penetrating Radar (GPR) vehicle, allowing georeferenced visual black and white and thermal IR imaging of pavement and deck surfaces concurrent with 3D GPR imaging of the subsurface. This research continues integration of the technology within Caltrans inspection practices through identification of commercial software solutions and development of processes and procedures for acquisition of georeferenced thermal IR data; processing of data to enhance, isolate, and visualize thermal anomalies; and interpretation and presentation of results. This report documents the research effort and results.]]></description>
      <pubDate>Wed, 05 Nov 2025 17:17:19 GMT</pubDate>
      <guid>https://trid.trb.org/View/2611038</guid>
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