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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>Practices for Transitioning to Digital Delivery Systems and Workflows</title>
      <link>https://trid.trb.org/View/2724648</link>
      <description><![CDATA[The transportation sector is undergoing a rapid transformation driven by digital technologies that are influencing how infrastructure is planned, designed, delivered, and managed. Across the United States, state departments of transportation (DOTs) have reported increasing interest in the potential of digital delivery, which is the exchange and use of digital information in standardized, accessible formats, to improve efficiency, reduce costs, and enhance lifecycle asset management. This shift is motivated by the need to overcome longstanding challenges associated with fragmented workflows, costly change orders, and inefficiencies tied to traditional processes and practices. This report, NCHRP Synthesis 664, documents state DOT practices for adopting and implementing digital delivery. Practices identified by the synthesis cover issues such as the status and maturity of digital delivery transitions, policy changes supporting implementation, documentation practices, organizational structures and champions, IT infrastructure, training, transition communications, data governance, and assessment. The report is organized as follows: chapter 2 is a review of existing literature on transitioning to digital delivery; chapter 3 summarizes survey results; chapter 4 provides five case examples of digital delivery transitions; chapter 5 summarizes findings from previous chapters and identifies the gaps in knowledge that could be addressed through future research.]]></description>
      <pubDate>Mon, 06 Jul 2026 16:28:58 GMT</pubDate>
      <guid>https://trid.trb.org/View/2724648</guid>
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      <title>Transportation Planning in Non-Metropolitan/Rural Areas</title>
      <link>https://trid.trb.org/View/2694542</link>
      <description><![CDATA[This report presents the state of practice of state departments of transportation (DOTs) regarding transportation planning in non-metropolitan (rural) areas of their states. The synthesis includes information on the structure and roles of regional planning entities (RPEs), communication and engagement practices, planning responsibilities and products, support for rural planning capacity, integration of transit and multimodal planning, and challenges to coordination. Under NCHRP Project 20-05/Topic 56-11, “Practices for Transportation Planning in Non-Metropolitan Areas,” the University of South Florida was asked to synthesize information to document state DOT practices for transportation planning in non-metropolitan areas. Information used in this study was obtained through a literature review, a survey of state DOTs, and interviews to develop in-depth case examples. The synthesis provides four case examples that highlight governance for planning in non-metropolitan areas, key coordination and support mechanisms used with RPEs or local governments, and barriers and challenges to non-metropolitan planning.]]></description>
      <pubDate>Sun, 26 Apr 2026 17:37:53 GMT</pubDate>
      <guid>https://trid.trb.org/View/2694542</guid>
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      <title>Coordination of Highway Safety Improvement Program and Highway Safety Office Activities</title>
      <link>https://trid.trb.org/View/2694541</link>
      <description><![CDATA[This report presents the state of practice of state departments of transportation (DOTs) on how they organize, manage, and align their Highway Safety Improvement Programs (HSIPs) and Highway Safety Offices (HSOs). The synthesis includes information on how state DOTs coordinate these functions through shared planning, data exchange, performance measures, and reporting processes. The synthesis also documents coordination practices related to funding, safety program implementation, public participation and engagement efforts, and the use of data tools and dashboards. Under NCHRP Project 20-05/Topic 56-19, “Practices on Coordination of HSIP and Highway Safety Office Activities,” the University of Missouri was asked to synthesize information to document current practices, challenges, and opportunities for improving coordination between HSIP and HSO management, practices, and associated funding. Information used in this study was attained through a literature review, a survey of state DOTs, and interviews to develop in-depth case examples. Chapter 4 provides six case examples that highlight how the interviewed state DOTs coordinate HSIP and HSO activities through shared performance measures, safety planning, crash data management, funding practices, and organizational structures, as well as challenges related to staffing, communication, and administrative processes.]]></description>
      <pubDate>Sun, 26 Apr 2026 17:37:52 GMT</pubDate>
      <guid>https://trid.trb.org/View/2694541</guid>
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    <item>
      <title>Funding for Maintenance of Complete Streets: A Synthesis of Highway Practice</title>
      <link>https://trid.trb.org/View/2674678</link>
      <description><![CDATA[As state departments of transportation (DOTs) expand active transportation infrastructure through Complete Streets programs, new challenges have emerged in maintaining these facilities. Roadway maintenance equipment is often incompatible with bicycle and pedestrian facilities, and additional funding for dedicated maintenance is limited. This synthesis examines how state DOTs manage the maintenance and funding of Complete Streets projects. The report explores maintenance policies and operations for active transportation facilities; cost-sharing approaches and funding models involving local governments and other partners; the role of local and tribal governments in maintenance agreements; and strategies for training, staffing, and equipment procurement to support Complete Streets maintenance. Contents include: (1) objectives, scope, and methodology; (2) literature review of Complete Streets policies and maintenance provisions; (3) summary of survey responses and current maintenance practices across state DOTS; (4) case examples of Complete Streets maintenance practices and challenges from five state DOTs; and (5) summary of key findings and recommendations for future research.]]></description>
      <pubDate>Thu, 26 Feb 2026 09:15:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/2674678</guid>
    </item>
    <item>
      <title>Mental Health, Suicide Prevention, and Addiction Mitigation in Construction and Maintenance</title>
      <link>https://trid.trb.org/View/2672716</link>
      <description><![CDATA[This report presents the state of practice of state departments of transportation (DOTs) on addressing mental health issues, suicide, and substance misuse in construction and maintenance workforces. The synthesis includes information on trends in these workplace issues and initiatives in use by state DOTs and industry partners to address them. Under NCHRP Synthesis Project 20-05/Topic 56-04, “Practices on Mental Health, Suicide Prevention, and Addiction Mitigation in Construction and Maintenance,” Colorado State University was asked to synthesize information to document state DOT practices on education and promotion of mental health, suicide prevention, and addiction mitigation for highway workers. Information used in this study was obtained through a literature review, a survey of state DOTs, and interviews to develop in-depth case examples. Chapter 4 provides five case examples that highlight policies, workforce awareness of programs, deployed mental health programs, performance measures, and organizational dynamics.]]></description>
      <pubDate>Sun, 22 Feb 2026 14:57:19 GMT</pubDate>
      <guid>https://trid.trb.org/View/2672716</guid>
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    <item>
      <title>Automated Traffic Signal Performance Measures: Management, Operation, and Maintenance</title>
      <link>https://trid.trb.org/View/2666815</link>
      <description><![CDATA[This report presents the state of practice of state departments of transportation (DOTs) on how they manage, operate, and maintain systems that use high-resolution traffic signal controller data to monitor and improve signal performance. The synthesis provides information on current automated traffic signal performance measures (ATSPMs) and crowdsourced signal performance measures. It describes common challenges and barriers to implementation, funding strategies, staffing and organizational factors, and examples of how agencies integrate these systems into daily operations and maintenance practices. Under NCHRP Synthesis Project 20-05/Topic 56-12, “Practices on Management, Operation, and Maintenance of Automated Traffic Signal Performances Measures,” Kittelson & Associates, Inc., was asked to (1) synthesize the information on current state DOT practices for enhancing traffic signal management, operations, and maintenance through the deployment and use of ATSPM systems; (2)  identify factors leading to ATSPM implementation; and (3) highlight challenges, experience gained, and knowledge gaps. Information used in this study was obtained through a literature review, a survey of state DOTs, and interviews to develop in-depth case examples. The report provides five case examples that highlight how the interviewed DOTs deploy and operate ATSPM solutions, the organizational and funding approaches they use, the challenges they encountered, and the benefits and experience gained through implementation.]]></description>
      <pubDate>Sat, 14 Feb 2026 19:11:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/2666815</guid>
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      <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>
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    <item>
      <title>Full-Depth Reclamation: Current Practices</title>
      <link>https://trid.trb.org/View/2607893</link>
      <description><![CDATA[The objective of this synthesis is to document practices used by state departments of transportation (DOTs) regarding the use of full-depth reclamation (FDR). FDR is a method to recycle in-place asphalt material for reconstruction and rehabilitation of flexible pavements. The synthesis documents state DOT classification of FDR types, site selection, specifications and guidelines for FDR mix design, and test methods to evaluate FDR quality. This synthesis gathered information through a literature review, a survey of state DOTs, and follow-up interviews with selected state DOTs. Five case examples examine the specific practices regarding use of FDR. Additional survey responses from non-state DOTs are available in Appendix C.]]></description>
      <pubDate>Sun, 12 Oct 2025 17:08:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2607893</guid>
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    <item>
      <title>Traffic Capacity Level of Service: Adaptations and Usage</title>
      <link>https://trid.trb.org/View/2591953</link>
      <description><![CDATA[The level of service (LOS) concept has been used for over 50 years by state departments of transportation (DOTs) in the U.S. for policy setting, planning, analysis, and communication efforts. Adoption of the LOS framework by individual state DOTs has generally been consistent with the Highway Capacity Manual, although usage and application may vary across different state DOTs.  NCHRP Synthesis 652: Traffic Capacity Level of Service: Adaptations and Usage, from TRB's National Cooperative Highway Research Program, includes findings that may assist state DOTs in improving their LOS practices and policies.]]></description>
      <pubDate>Wed, 20 Aug 2025 16:03:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2591953</guid>
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    <item>
      <title>Practices for Collecting, Managing, and Using Light Detection and Ranging Data</title>
      <link>https://trid.trb.org/View/2588967</link>
      <description><![CDATA[In recent years, Lidar technology has improved. Additionally, the experiences of state departments of transportation (DOTs) with Lidar have grown, and documentation of existing practices, business uses, and needs would now benefit state DOTs’ efforts. This synthesis, from the Transportation Research Board's (TRB’s) National Cooperative Highway Research Program, documents state DOTs’ practices related to technical, administrative, policy, and other aspects of collecting, managing, and using Lidar data to support current and future practices.]]></description>
      <pubDate>Thu, 14 Aug 2025 09:52:50 GMT</pubDate>
      <guid>https://trid.trb.org/View/2588967</guid>
    </item>
    <item>
      <title>Asset Management Practices for Mechanically Stabilized Earth Walls</title>
      <link>https://trid.trb.org/View/2582994</link>
      <description><![CDATA[Mechanically stabilized earth (MSE) walls are widely used in transportation projects due to their cost-saving, time-efficient, and resilient nature. However, most of the walls constructed so far have been built too recently to allow assessment of whether or not they would meet the desired design life. Additionally, design guidelines, construction materials, and protocols have greatly evolved since the technology was first adopted. Therefore, the early MSE walls constructed using the original design guidelines and construction protocols may be inadequate according to the current state of practice. Some of these early structures have failed unexpectedly due to deterioration over time. Deterioration processes in MSE walls may involve different types of mechanisms with different onsets and may progress at different rates. Collectively, these mechanisms contribute variably to the overall deterioration rate of a wall during its service life. No standard practices exist that state departments of transportation (DOTs) can use in managing MSE wall assets. The objective of this synthesis is to document state DOT asset management practices for MSE walls in their inventories. Relevant practices include those related to maintenance and rehabilitation of deteriorated walls, inventory and assessment, and development of risk and life-cycle costs. Information for this study was gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected DOTs. Case examples based on five state DOTs provide additional information on managing MSE walls and developing retaining wall inventories.]]></description>
      <pubDate>Sat, 09 Aug 2025 13:02:42 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582994</guid>
    </item>
    <item>
      <title>Construction Stormwater Program Management, Tracking, Reporting, and Compliance</title>
      <link>https://trid.trb.org/View/2582399</link>
      <description><![CDATA[State department of transportation (DOT) construction activities must comply with federal and state National Pollutant Discharge Elimination System construction general permit requirements. The regulations require state DOTs to implement policies, procedures, and practices to minimize offsite discharges of sediment-laden stormwater to protect downstream receiving water bodies during construction. To obtain permit coverage, regulated construction activities require the development, implementation, and maintenance of project-specific stormwater pollution prevention plans (SWPPPs). The SWPPP provides construction stormwater-related management requirements and details on the installation and maintenance of structural and non-structural practices implemented during land-disturbing activities. The objective of this synthesis is to document state DOT practices, tools, and approaches for managing compliance with state and federal construction stormwater permit requirements. Information for this study was gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected DOTs. Case examples of six state DOTs provide additional information on construction stormwater program management practices.]]></description>
      <pubDate>Thu, 31 Jul 2025 15:26:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582399</guid>
    </item>
    <item>
      <title>Practices to Enhance Resiliency of Existing Roadway and Embankment Culverts</title>
      <link>https://trid.trb.org/View/2582401</link>
      <description><![CDATA[Culverts are buried drainage structures underneath roadways or embankments that are open at both ends and used to convey and transport water. Culverts were frequently identified as vulnerable components to extreme weather events and climate change during a 2013–2015 pilot study (FHWA-HEP-16-079), and many culverts under the jurisdiction of state departments of transportation (DOTs) were designed and installed well before the effects of climate change were understood or realized. Existing culverts must be able to handle the increasing frequency and severity of extreme weather events [National Oceanic and Atmospheric Administration (NOAA) 2023; Pluimer 2023], which can accelerate failure mechanisms and shorten culvert expected design lifetimes. Accelerated deterioration of culverts can lead to a suite of unplanned repairs, rehabilitation projects, or full replacements, all of which are financially burdensome and present issues of staffing or sourcing of work to state DOTs. The needs of state DOTs to improve resilience are common, but practices may be diverse due to variability in climate, weather events, seismic susceptibility, slope and embankment stability, watershed characteristics, and challenges due to urban development and land usage. The objective of this synthesis is to document management and maintenance practices used by state DOTs to enhance resiliency of existing roadway and embankment culverts. Information for this study was gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected DOTs. Case examples of five state DOTs provide additional information related to their maintenance practices for wide cracks and joints in flexible and composite pavements.]]></description>
      <pubDate>Thu, 31 Jul 2025 15:26:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582401</guid>
    </item>
    <item>
      <title>Use of Supplementary Cementitious Materials for Concrete</title>
      <link>https://trid.trb.org/View/2582400</link>
      <description><![CDATA[The use of supplementary cementitious materials (SCMs) in concrete mixtures has been a common practice of state departments of transportation (DOTs) since the early 1980s. SCMs are nonorganic additives used in concrete mixtures, either as a partial replacement of Portland cement in the mixture or as a preblended material with the cement. Commonly used SCMs include fly ash, slag cement, and silica fume. Due to the increasing unavailability of fly ash in many regions, state DOTs have been considering and using alternative SCMs. The objective of this synthesis is to document state DOT practices for specifying and using SCMs in concrete. Information for this study was gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected DOTs. Case examples of five state DOTs provide additional information on the use of SCMs for concrete.]]></description>
      <pubDate>Thu, 31 Jul 2025 15:26:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582400</guid>
    </item>
    <item>
      <title>Management Practices for Ancillary Transportation Assets</title>
      <link>https://trid.trb.org/View/2569141</link>
      <description><![CDATA[Starting with the 2012 Moving Ahead for Progress in the 21st Century (MAP-21) Act, asset management was mandated to be a performance- and outcome-driven program. Subsequent reauthorization acts have continued to emphasize a performance-based approach for pavements and bridges. Recognizing the value of managing a broader range of assets beyond pavements and bridges, many departments of transportation (DOTs) are developing dynamic inventories of various ancillary assets in their Transportation Asset Management Plans (TAMPs). The objective of this synthesis is to document practices used by state DOTs for managing selected ancillary transportation assets, including the levels of maturity and variability in practices across state DOTs. Information for this study was gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected DOTs. Case examples of five state DOTs provide additional information related to their program management and their use of technology in their certification programs.]]></description>
      <pubDate>Sat, 28 Jun 2025 18:08:04 GMT</pubDate>
      <guid>https://trid.trb.org/View/2569141</guid>
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