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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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      <title>The Public Response to the Secretary of Transportation’s Rail Services Report: Rail Service in the Midwest and Northeast Region, Volume I: New England States</title>
      <link>https://trid.trb.org/View/2720098</link>
      <description><![CDATA[Volume I of The Public Response to the Secretary of Transportation’s Rail Services Report is part of a three-volume Rail Services Planning Office report summarizing public testimony, written submissions, shipper evidence, state and local concerns, and agency comments on the Secretary of Transportation’s 1974 rail service recommendations. Volume I covers the New England portion of the 3R Act region: Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut. Prepared by the Rail Services Planning Office of the Interstate Commerce Commission for the United States Railway Association, the report organizes the public record by state, DOT service zone, and individual rail line. It documents local responses to proposed abandonments, excess-line designations, and service recommendations, including concerns about industrial dependence on rail, forest-products and agricultural traffic, access to Canadian rail connections, passenger-service proposals, energy efficiency, environmental effects, and the economic consequences of losing rail service. In the broader 3R Act process, the report served as an evidentiary bridge between the Secretary’s initial rail service plan and USRA’s later Preliminary and Final System Plans. Rather than proposing a complete restructuring plan of its own, Volume I captured the public and institutional response that USRA was expected to consider when determining which lines should be included in Conrail, preserved through subsidy, transferred to other operators, or abandoned. Overall, the report illustrates how national rail restructuring policy was tested against local economic dependence on rail service in the New England states.]]></description>
      <pubDate>Sun, 19 Jul 2026 19:13:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2720098</guid>
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      <title>New Hampshire: Highway Safety Improvement Program 2018 Annual Report</title>
      <link>https://trid.trb.org/View/2703978</link>
      <description><![CDATA[The Highway Safety Improvement Program (HSIP) is a core Federal-aid program with the purpose of achieving a significant reduction in fatalities and serious injuries on all public roads. As per 23 U.S.C. 148(h) and 23 CFR 924.15, States are required to report annually on the progress being made to advance HSIP implementation and evaluation efforts. The format of this report is consistent with the HSIP Reporting Guidance dated December 29, 2016 and consists of five sections: program structure, progress in implementing highway safety improvement projects, progress in achieving safety outcomes and performance targets, effectiveness of the improvements and compliance assessment.]]></description>
      <pubDate>Sat, 30 May 2026 11:55:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2703978</guid>
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      <title>New Hampshire: Highway Safety Improvement Program 2017 Annual Report</title>
      <link>https://trid.trb.org/View/2696975</link>
      <description><![CDATA[The Highway Safety Improvement Program (HSIP) is a core Federal-aid program with the purpose of achieving a significant reduction in fatalities and serious injuries on all public roads. As per 23 U.S.C. 148(h) and 23 CFR 924.15, States are required to report annually on the progress being made to advance HSIP implementation and evaluation efforts. The format of this report is consistent with the HSIP Reporting Guidance dated December 29, 2016 and consists of five sections: program structure, progress in implementing highway safety improvement projects, progress in achieving safety outcomes and performance targets, effectiveness of the improvements and compliance assessment.]]></description>
      <pubDate>Mon, 11 May 2026 14:40:15 GMT</pubDate>
      <guid>https://trid.trb.org/View/2696975</guid>
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    <item>
      <title>New England Transportation Consortium 2024 Research Peer Exchange</title>
      <link>https://trid.trb.org/View/2606940</link>
      <description><![CDATA[Connecticut Department of Transportation, Maine Department of Transportation and New Hampshire Department of Transportation, in collaboration with the New England Transportation Consortium (NETC), hosted a peer exchange on June 25, 26 and 27, 2024, to discuss topics related to transportation research with other state departments of transportation (DOTs). The meeting and the subsequent publication of this report fulfill all three agencies’ obligations to conduct a periodic peer exchange as part of the federal State Planning & Research program. The peer exchange was funded through the NETC pooled fund, whose members are the three host agencies as well as Massachusetts DOT, Rhode Island DOT and Vermont Agency of Transportation. The event focused on three primary topics: engaging subject matter experts; optimizing research budget and staff; and facilitating technology transfer. Participants of the three-day event included staff from all three host states, two additional NETC member states (Massachusetts and Vermont), four other state transportation agencies (Mississippi, Nevada, New Jersey and Utah DOTs), and the Federal Highway Administration. Based on presentations and group discussions, participants shared what they saw as strengths, challenges and opportunities for the host agencies in the areas discussed. They also shared their own takeaways for their home agencies.]]></description>
      <pubDate>Thu, 23 Oct 2025 09:23:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2606940</guid>
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      <title>Improved Load Rating Procedures for Deteriorated Unstiffened Steel Beam Ends</title>
      <link>https://trid.trb.org/View/2601464</link>
      <description><![CDATA[This report contains the contents of the project to enhance load rating methods for assessing corroded unstiffened beam ends for the six New England States. The first task of the project was to collect and compile inspection reports information provided by state departments of transportation (DOTs) within New England. The research team was able to carefully identify trends and patterns in the data, which was used to determine the most common scenarios of corrosion encountered in bridges within New England States. Following this task, corroded bridge girder specimens were selected from existing structures to be documented and experimentally tested in the structural testing facility at UMass Amherst. The specimens were also computationally analyzed for their section loss and remaining capacity. The final goal of this project was to evaluate the load rating procedures across all of the New England States and recommend updates to the procedures based on the experimental and analytical results.]]></description>
      <pubDate>Tue, 30 Sep 2025 16:25:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/2601464</guid>
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    <item>
      <title>Development of Design Profiles &amp; Parameters using Measurement While Drilling (MWD) and Permeafor Data</title>
      <link>https://trid.trb.org/View/2582031</link>
      <description><![CDATA[The New Hampshire Department of Transportation (NHDOT) has recently invested in two new technologies to improve geotechnical site characterization for stormwater best management practices (BMPs) and to improve the efficiency and accuracy of geotechnical subsurface models for bridge and roadway designs.  The need for time consuming borehole infiltration testing and standard penetration testing may be reduced through further deployment of Permeafor and Measurement While Drilling (MWD).  
This project will advance integration of these technologies by ensuring current hardware, software, and data analysis methods are updated with best available methods.  It will also assist in installation and troubleshooting of new equipment on a recently acquired drill rig, train field staff on the use and care of these technologies, and train technical staff on data reduction and interpretation of results. Specifications will be proposed for inclusion in the NHDOT Geotechnical Manual. 
This project builds upon work conducted under previous Projects 26962 and 42372F which led to significant improvements in the capabilities of the NHDOT Geotechnical section to meet their needs for the design of various structures across New Hampshire. These efforts will support more efficient use of design and construction resources, reduce the chance of delays due to unexpected subsurface conditions, and potentially help reduce the time associated with conventional subsurface investigation programs in the long term.  ]]></description>
      <pubDate>Thu, 24 Jul 2025 14:03:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582031</guid>
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      <title>Laboratory Testing &amp; Field Performance of NHDOT Hot Mix Asphalt (HMA) Mixes</title>
      <link>https://trid.trb.org/View/2582030</link>
      <description><![CDATA[Since 2016, UNH has performed testing on over 60 New Hampshire Department of Transportation (NHDOT) hot mix asphalt (HMA) mixtures. These tests provide measurements of stiffness, fatigue cracking, low temperature cracking, and overall durability.  The information gathered from these tests can be used in mechanistic-empirical pavement design and various indices can estimate the relative performance of the mixture in the field under real-world applications. This research will compare the laboratory performance predictions to year-to-year field collected pavement condition data. 
The objectives of this project are to evaluate correlations between mix design attributes, performance properties, and field performance to support specification updates.  Predictive models will be developed for estimating mixture performance properties from mix design attributes to support balanced mix design (BMD) and PavementME implementation in NH.  A model will be developed to estimate longevity of different mixture and pavement types in NH. This in future can support on-going NHDOT AMPS effort on asset management performance models.  Recommendations will be provided to NHDOT regarding how it can improve processes (e.g. mix design and material specifications). 
This project builds upon work conducted under previous Projects 15680R, 26962O, and 26962N. These projects conducted extensive testing and developed appropriate laboratory conditioning methods for HMA mixtures to simulate NH conditions. The results of this project will help NHDOT better understand the performance of HMA mixes and inform decisions by lowering life cycle costs and increasing service life and mix performance. 
]]></description>
      <pubDate>Thu, 24 Jul 2025 13:59:29 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582030</guid>
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    <item>
      <title>Designing Culverts in Tidal Settings in New Hampshire—Unique Considerations and Applications</title>
      <link>https://trid.trb.org/View/2553924</link>
      <description><![CDATA[In a unique collaboration between the New Hampshire Department of Transportation, the New Hampshire Department of Environmental Services Coastal Program, and the Nature Conservancy, CMA Engineers, with Streamworks, PLLC, completed the planning and design of culvert replacements in tidal settings on State roadways in Rye and Stratham. The structures were chosen in a review of all coastal crossings in New Hampshire because they are tidal restrictions to a total of 48 acres of upstream salt marsh migration potential and are in poor structural condition. Two important climate change impacts will affect these and other tidal structures: increasing sea level and storm surge elevations affecting future tidal flows and increasing precipitation intensity affecting future freshwater streamflow. Comprehensive and complex hydrologic and 2D hydraulic evaluations were developed for each site that modeled both tidal and stormwater flows under both existing and future scenarios incorporating climate change. Sea level rise was considered based on relative vulnerability for each site. The alternatives in this project were evaluated considering several metrics unique to tidal settings: accommodating bi-directional flow, potential for salt marsh migration, aquatic and terrestrial organism passage, and flooding impacts. The selected and preferred alternatives included significant increases in culvert widths, from 3.5 to 15 ft at Rye and from 1.5 to 8 ft at the two adjacent culverts in Stratham. Future roadway elevations were considered for sea level rise, and structural accommodation for possible future roadway raising was accommodated at the Rye culvert. The project was awarded competitive grant funding from NOAA through the Bipartisan Infrastructure Law for final design, permitting, and construction.]]></description>
      <pubDate>Wed, 11 Jun 2025 10:53:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2553924</guid>
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    <item>
      <title>Manchester Biofabrication Cluster Transportation Equity Study</title>
      <link>https://trid.trb.org/View/2499195</link>
      <description><![CDATA[The Manchester Biofabrication Cluster Transportation Equity Study describes the challenges and provides recommendations to improve transportation equity in the ReGen Valley Tech Hub (designated by the US Economic Development Administration (EDA) in 2023). The ReGen Valley Tech Hub, located in the Manchester's Millyard District, projects that the regional biofabrication workforce will grow by approximately 9,000 new employees over the next ten years, on an already transportation-constrained site. This report details recommendations for how to ensure that future employees, specifically from traditionally underserved background, can easily, safely, and equitably access these jobs. The report argues that a business-as-usual approach to transportation access to and within the Millyard is unsustainable and that a diversified portfolio of transportation access, management, and circulation strategies will provide both equity benefits and facilitate continued growth for the Manchester BioFabrication industry and education pipeline.]]></description>
      <pubDate>Tue, 18 Feb 2025 10:45:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/2499195</guid>
    </item>
    <item>
      <title>New England Mileage Fee Survey [supporting dataset]</title>
      <link>https://trid.trb.org/View/2487858</link>
      <description><![CDATA[Fleet diversification and increases in energy efficiency continue to weaken the revenue-generating ability of motor fuels taxes (colloquially, “gas taxes”), which are a large source of funding for transportation projects. While alternative funding schemes are necessary, consensus amongst policymakers is lacking and public acceptance of changes to the gas tax is low. The authors surveyed residents of Vermont, Maine, and New Hampshire to gauge understanding of and support for a mileage fee and a flat fee as potential replacements for the gas tax. Throughout the survey, respondents were provided information and learning opportunities to “myth bust” common misconceptions about the gas tax and the potential policy alternatives. The authors find that, before education, respondents knew very little about how the current gas tax works and showed minimal support for the proposed policy alternatives. Post-education, support for mileage fees increased by 11%, and the impact of the education was statistically significant in increasing policy support.  Additional regression models revealed that while perceptions of fairness may not be easily changed with education in a survey format, presenting respondents with personalized cost estimates was a highly effective way to increase policy support. Overall, the authors find responding to common public concerns with up-to-date and non-biased information within a relatively simple learning experience can cause substantial changes in policy support. The findings offer an avenue to understand how support for gas tax alternatives varies amongst different groups of people and the role that education can play in increasing policy support in the face of widespread misconceptions.]]></description>
      <pubDate>Tue, 21 Jan 2025 09:16:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2487858</guid>
    </item>
    <item>
      <title>Design, Construction, and Performance of Ground Improvement for NHDOT True Abutment</title>
      <link>https://trid.trb.org/View/2452768</link>
      <description><![CDATA[This paper presents the design, installation, quality control, and performance monitoring data for a true abutment system on improved ground, US Route 4 over Spaulding Turnpike in Newington-Dover, New Hampshire. The ground improvement system, comprising rigid inclusions with a load transfer platform, was implemented by a specialty subcontractor to meet bearing capacity and settlement performance criteria for the abutments and mechanically stabilized earth walls for a new bridge. Settlement criteria were 7.5 cm of total settlement, measured at the bottom of the walls, with 2.5 cm of that total being long-term or post-construction. Wall heights up to 9 m were proposed on a soft soil profile with very soft marine silts with clays encountered between 1.5 and 4.5 m deep, of which up to 5.5 m in thickness was weight of hammer. Design, installation, and testing of ground improvement were completed in September 2017, with bridge completion in early 2018. The performance monitoring devices used include settlement plates, survey monitoring points on the outside of the MSE walls, and vertical inclinometers installed through the soft soils to the rigid inclusion bearing layer, a dense fine sand glacial outwash layer.]]></description>
      <pubDate>Sat, 30 Nov 2024 11:49:35 GMT</pubDate>
      <guid>https://trid.trb.org/View/2452768</guid>
    </item>
    <item>
      <title>Structural Health Monitoring of a Bridge Deck Reinforced with Carbon Fiber Reinforced Polymeric Grids in Rollinsford, New Hampshire</title>
      <link>https://trid.trb.org/View/2209191</link>
      <description><![CDATA[In December 2000, the Rollins Road Bridge in Rollinsford, New Hampshire was opened to traffic. The Rollins Road Bridge was constructed with funding from the Innovative Bridge Research and Construction (IBRC) program administered by the Federal Highway Administration (FHWA). A requirement of the IBRC program is the use of high performance and innovative materials. The deck of the Rollins Road Bridge is high-performance concrete (HPC) reinforced with carbon fiber reinforced polymers (CFRP). These materials were selected to create a durable concrete superstructure that is free of metallic reinforcement. Also as part the IBRC program, Rollins Road Bridge was instrumented with a series of strain and temperature sensors to monitor and study the structural behavior of the bridge deck. This paper describes a program of structural health monitoring for the Rollins Road Bridge, the first bridge in the United States to contain high performance concrete (HPC) and state-of-the-art carbon fiber reinforced polymeric (CFRP) grids). Over 80 fiber optic sensors, measuring strain and temperature, were installed in the bridge during construction, including both the CFRP and concrete material in the deck and the concrete girders. Strain distributions collected from these fiber optic sensors shows that the maximum strains in the actual bridge were less than 100 micro strains, while deflections of the girders and deck were less than 0.1 in (2.5 mm) under a sustained truck load within the first two years of service in 2002. This paper focuses on the potential use of the collected data, from both strain and temperature sensors to conduct in-service performance monitoring. The recent data will be compared with the baseline data collected in 2002.]]></description>
      <pubDate>Tue, 22 Oct 2024 15:57:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/2209191</guid>
    </item>
    <item>
      <title>Accounting for the Impact of Thermal Loads in Nondestructive Bridge Testing</title>
      <link>https://trid.trb.org/View/2235432</link>
      <description><![CDATA[Nondestructive testing on bridges is a large part of a comprehensive structural health monitoring program. Another key component of structural health monitoring is finite element models for evaluation of the measured responses through model updating and parameter estimation. One method of nondestructive testing is a controlled static load test, where a pre-weighed truck is placed at predetermined locations on the bridge and the response is measured via strain, rotation, and deflection measurements. The location, wheel weights, and time at each location are precisely recorded during the entire duration of the load test. However, there is another load that can have more of an impact on the bridge response than applied static load, and that is thermal loading due to temperature change. It has been observed in three different load tests at Rollins Road Bridge in Rollinsford, NH that temperature effects mask the load applied to the bridge over the duration of the load test. These temperature effects either need to be corrected for, using an empirical correction, or included into the structural predictive model to get accurate results for use in a parameter estimation algorithm and model updating protocol to determine the structural health of the bridge.]]></description>
      <pubDate>Mon, 24 Jun 2024 09:31:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/2235432</guid>
    </item>
    <item>
      <title>New Hampshire Department of Transportation - Development of an Unmanned Aircraft Systems (UAS) Program</title>
      <link>https://trid.trb.org/View/2381770</link>
      <description><![CDATA[Unmanned Aircraft Systems (UAS) are being used nationwide in an effort to improve safety, increase efficiency, increase quality, and reduce costs. A previous New Hampshire Department of Transportation (NHDOT) research project tested UAS technology to ascertain the ability to assist NHDOT with operations, development, and the execution of transportation-related projects. The study also assessed UAS uses for other NH state agencies such as the Department of Safety. To facilitate deployment of UAS in the day-to-day activities of NHDOT, a UAS program plan was needed to outline the organizational structure and program requirements to support implementation of this valuable technology. This report outlines the phased implementation of UAS by NHDOT over the course of three years. The roadmap outlines a short-term, medium-term, and long-term approach that focuses on scaling up and accelerating a UAS program. The proposed timeline reflects the current position of the UAS program and the progress NHDOT has made to date as the starting point. The outlined timeline also accounts for the experiences of other public sector agencies and reflects the estimated amount of time that it will take to acquire the appropriate technology, develop consensus regarding the priorities for implementation of the UAS program, and develop in-house capabilities to the appropriate level. This roadmap recommends steps for (1) maintaining leadership support; (2) identifying methods for obtaining stakeholder feedback; (3) suggesting roles and responsibilities for various functions within the UAS program; (4) defining specific missions for UAS operations; (5) identifying the appropriate UAS platforms and sensors to accomplish the defined missions; (6) formally adopting UAS Program Policies and Procedures; (7) establish a training and maintenance program; and (8) procuring the necessary data management and analysis tools and expertise required for the defined missions. The roadmap also discusses the importance of tracking costs against conventional techniques for conducting the same job to validate the appropriate uses of UAS within NHDOT.]]></description>
      <pubDate>Fri, 07 Jun 2024 16:59:26 GMT</pubDate>
      <guid>https://trid.trb.org/View/2381770</guid>
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      <title>Advancing Subsurface Investigations Beyond the Borehole with Passive Seismic Horizontal-to-Vertical Spectral Ratio and Electromagnetic Geophysical Methods and Transportation Infrastructures in New Hampshire</title>
      <link>https://trid.trb.org/View/2381769</link>
      <description><![CDATA[Geotechnical site characterization sometimes fails to fully characterize the below-ground bedrock surface and hydrologic conditions using conventional borings. By combining geophysical and boring data analysis, transportation projects can produce a more thorough and accurate representation of geotechnical subsurface conditions, reducing the disruption work plans, forced revision of designs, and cost increases from schedule delays, claims, or change orders. The U.S. Geological Survey (USGS), in cooperation with New Hampshire Department of Transportation (NHDOT) surveyed transportation infrastructure sites using rapidly deployable geophysical methods to assess benefits added to a comprehensive site characterization with traditional techniques. Horizontal-to-vertical spectral-ratio (HVSR) passive-seismic and electromagnetic induction (EMI) methods were applied at four sites including a roadway-stream crossing, roadway-bridge rail-trail crossing, commuter-parking expansion, and a railroad-adjacent river-cutback slope-failure site, Additionally, ground-penetrating radar (GPR) was used at the slope-failure site. Typically, at transportation projects, subsurface geotechnical properties are determined from boring data; however, borings are often spaced hundreds of feet apart, potentially missing important spatial variability between boreholes. Geotechnical site characterization including geophysical surveys helped to provide a more accurate characterization by using continuous or near continuous profiling.]]></description>
      <pubDate>Fri, 07 Jun 2024 16:59:26 GMT</pubDate>
      <guid>https://trid.trb.org/View/2381769</guid>
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