<rss version="2.0" xmlns:atom="https://www.w3.org/2005/Atom">
  <channel>
    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
    <description></description>
    <language>en-us</language>
    <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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
      <url>https://trid.trb.org/Images/PageHeader-wTitle.jpg</url>
      <link>https://trid.trb.org/</link>
    </image>
    <item>
      <title>Factors Influencing the Performance of Critical Land Transport Infrastructure Elements</title>
      <link>https://trid.trb.org/View/1642544</link>
      <description><![CDATA[Land transport infrastructure provides services essential to a modern society’s functioning. Transport infrastructure elements such as road and railway structures are used every day by more and more people, and disruption to or failure of these elements would have a broad impact. The importance of these elements depends on the level of performance they provide, i.e., their traffic-carrying capacity and traffic intensity. This performance can be affected by negative factors such as the escalation, exposure, de-escalation and intensity of undesirable events. However, the effects of these negative factors can be minimized by positive factors that improve the resilience of transport infrastructure elements. These factors include the robustness, recoverability and adaptability of transport structures. The article aims to integrate definitions and describe how factors negatively or positively influence the performance of critical land transport infrastructure elements.]]></description>
      <pubDate>Mon, 02 Sep 2019 16:33:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/1642544</guid>
    </item>
    <item>
      <title>Assessment of the BDM Waterproofing Membrane System</title>
      <link>https://trid.trb.org/View/1599295</link>
      <description><![CDATA[Concrete bridge deck deterioration is one of the most extensive bridge maintenance problems affecting service life. Moisture and chloride intrusion can accelerate concrete bridge deck distress. Waterproofing membranes, when applied properly, extend the life of the bridge decks delaying the need for rehabilitation. They do this by preventing the penetration of chloride ions and other corrosives that ultimately lead to deterioration of the reinforcing steel and concrete. However, the waterproofing membranes can be difficult to apply and may be punctured or damaged during the construction process. Damaged areas readily allow for the penetration of contaminants, which are not easily expelled as they become trapped below the membrane. Additionally, bridge membranes, like all materials, age and need replacement, a process that requires specialized equipment and skill to remove the bituminous concrete pavement and underlying membrane without causing damage to the underlying concrete bridge deck. Overall, anecdotal evidence suggests varying degrees of success with respect to application, durability, and overall effectiveness. Bridge membranes may be comprised of various materials, each with unique characteristics including method of application, bond strength, compressibility, and tensile strength. This study used a spray-on polyurethane membrane waterproofing system produced by Bridge Preservation LLC called Bridge Deck Membrane (BDM). Annual site visits show no evidence of deterioration or membrane penetration. Thus far, the BDM system has performed as expected, and with little issue.]]></description>
      <pubDate>Wed, 17 Apr 2019 19:02:52 GMT</pubDate>
      <guid>https://trid.trb.org/View/1599295</guid>
    </item>
    <item>
      <title>Assessment of Poly-Carb Flexogrid Bridge Deck Overlay System</title>
      <link>https://trid.trb.org/View/1599294</link>
      <description><![CDATA[Mark-163 Flexogrid by Poly-Carb is a high friction bridge deck overlay system that is designed to be used for the waterproofing and skid proofing of bridge decks. This product was tested on Town Highway 4, Bridge 8 in Waterford, Vermont, as it passes over I-93 in May 2013. The Flexogrid system has performed as expected, providing good skid resistance, and waterproofing the deck. Some aggregate has been observed to be raveling off the surface, but not at a concerning rate.]]></description>
      <pubDate>Wed, 17 Apr 2019 19:02:52 GMT</pubDate>
      <guid>https://trid.trb.org/View/1599294</guid>
    </item>
    <item>
      <title>Assessment of Super-Slab, a Precast Concrete Bridge Approach Slab</title>
      <link>https://trid.trb.org/View/1599301</link>
      <description><![CDATA[With a growing amount of highway infrastructure in need of reconstruction or rehabilitation and ever-increasing construction costs, State Agencies are seeking cost effective methods of increasing the service life of infrastructure and reducing construction times. Prefabricated elements and systems, such as deck panels and stay in place forms, have many advantages including less disruption to the traveling public and environment, rapid deployment, and are manufactured under a controlled environment. However, there are other considerations such as planning, handling and transport, modular integration, and proper placement. In an effort to decrease construction times and improve overall quality, Fort Miller Co., Inc. has developed a product known as “Super-Slab,” a pre-cast pavement system. Once cast and cured at a concrete plant, the slabs are placed upon an engineered subgrade and then grouted into place with a bedding grout distribution system. Fort Miller Co. provides both engineering design and installation guidance in conjunction with the process. Slab dimensions are reportedly accurate to within ±1/8 in. This system is designed for use as bridge approaches, ramps, intersections, and continuous mainline pavements. Super-Slabs were used in Vermont in 2011 as the approaches to two bridges in Chester. This report describes the construction and performance experience with these two installations.]]></description>
      <pubDate>Wed, 17 Apr 2019 19:02:52 GMT</pubDate>
      <guid>https://trid.trb.org/View/1599301</guid>
    </item>
    <item>
      <title>Durability for concrete structures in marine environments of HZM project: Design, assessment and beyond</title>
      <link>https://trid.trb.org/View/1541095</link>
      <description><![CDATA[This paper reviews the fundamentals of the durability of structural concrete, and then applies the concepts to the durability design, quality control, performance assessment and maintenance planning of concrete structures in Hong Kong-Zhuhai-Macau (HZM) sea link project with design working life of 120 years. The durability design adopts a multi-level philosophy for different durability risks and uses model-based approach to determine design parameters. The long-term exposure data of 30 years were used to calibrate the chloride ingress model and quantify the modelling uncertainty. The durability quality control was realized through converting the design values to laboratory characterization values, especially for the chloride diffusivity. With the data collected in construction phase, a full-probabilistic assessment is performed on the achieved performance against the chloride ingress, serving as basis for maintenance planning. The open issues related to the durability of concrete infrastructures with long service life are elaborated in the end.]]></description>
      <pubDate>Thu, 11 Oct 2018 17:06:51 GMT</pubDate>
      <guid>https://trid.trb.org/View/1541095</guid>
    </item>
    <item>
      <title>Bridge Deck Protection Systems</title>
      <link>https://trid.trb.org/View/1499668</link>
      <description><![CDATA[This report describes the progress made to date on a project designed to test several promising bridge deck protective systems. Four waterproofing membranes are under test and additional installations of other systems are planned. The membranes are being evaluated by visual inspection and by means of moisture detecting instrumentation placed beneath the membranes on the test bridges. The results so far must be considered tentative but appear to indicate that an asbestos modified asphalt system and a hot applied liquid system are performing better than two preformed sheet systems. In terns of ease of construction, however, there was almost unanimous preference for the preformed sheet systems. The installations, instrumentation, and performance of these membranes are discussed in detail in this report.]]></description>
      <pubDate>Tue, 27 Mar 2018 17:27:34 GMT</pubDate>
      <guid>https://trid.trb.org/View/1499668</guid>
    </item>
    <item>
      <title>A Software Tool for Reliability, Analysis, and Security Assessment of Water Distribution Systems</title>
      <link>https://trid.trb.org/View/1275017</link>
      <description><![CDATA[Water utilities have become more and more concerned with the service performance, reliability and resilience of water distribution systems (WDS). The objective of this study is to develop a software tool based on a geographic information system (GIS) for the comprehensive analysis and assessment of WDS. The software integrates EPANET to perform hydraulic and water quality simulations. The software consists of three modules: performance assessment, reliability analysis and post-earthquake restorability estimation. The module of the performance assessment comprises three elements: state variable, service curve and operator function. In the reliability analysis module, the reliability index of the node is obtained by the use of Euclidean distance. The nodal demands are weighted to generate the reliability index of the entire network system. In the module of the post-earthquake restorability estimation, the leakage magnitude is modeled and a hydraulic simulation is performed by EPANET. The restorability of the entire network system can be evaluated by the software. The outputs of the software can give a straightforward understanding of the results that contribute to the knowledge of the water distribution system.]]></description>
      <pubDate>Wed, 30 Apr 2014 10:12:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/1275017</guid>
    </item>
    <item>
      <title>The Economics of Speed - Assessing the Performance of High Speed Rail in Intermodal Transportation</title>
      <link>https://trid.trb.org/View/1231940</link>
      <description><![CDATA[The purpose of the proposed research is to understand how the operating speed of a high-speed system influences its performance within the context of the inter-modal transportation system. It aims to clarify how performance enhancement resulting from a marginal increase in line-haul speed varies depending on the structure of the intermodal network. The research focuses initially on the supply side with the specification and estimation of rail cost functions in which speed is included explicitly. These can then be integrated into origin-destination performance measures at the intermodal level. Additional work can follow to look at the demand side. There are many fairly good models of demand that relate performance to market share and other related indicators, although speed is often embedded in these models and is not easily parsed out as a decision variable. But there is a real dearth of cost models, especially ones where speed is an explicit exogenous variable. This research aims to fill this gap. It will add to current University of California Transportation Center (UCTC) funded work on intermodal measures of performance by integrating speed into the performance assessment of intermodal systems. The ultimate purpose is to inform policy regarding the choice of technology and configuration for high-speed rail systems.]]></description>
      <pubDate>Thu, 03 Jan 2013 14:28:58 GMT</pubDate>
      <guid>https://trid.trb.org/View/1231940</guid>
    </item>
    <item>
      <title>Material Performance Assessment of Cross-Tie Alternatives for Rail Applications</title>
      <link>https://trid.trb.org/View/1229738</link>
      <description><![CDATA[Historically, the rail industry has relied primarily upon the lumber industry for materials to manufacture wooden cross-ties. Future developments are needed as a result of the limited amount of raw timber available for the manufacturing timber cross-ties, which typically requires old growth timber. Over the past few decades, pre-stressed concrete has become a favorable alternative for rail companies and are increasing in popularity, but this solution still has a number of shortcomings. New material developments and advances in manufacturing technologies potentially allow for the development of sustainable material solutions that can be used to preserve and repair existing ties or incorporate recycled products into the manufacturing of new cross-ties. For these new alternatives it is important to look closely at their availability, durability, and their potential for reuse and recycling at the end of their service life. The objective of this research project is to identify and evaluate alternatives to wooden railroad cross-ties.]]></description>
      <pubDate>Thu, 03 Jan 2013 13:47:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/1229738</guid>
    </item>
    <item>
      <title>Soil Investigation of Fly Ash Deposit Improved by Heavy Compaction Method</title>
      <link>https://trid.trb.org/View/1140769</link>
      <description><![CDATA[An in situ test program was undertaken to systematically investigate the effectiveness of the heavy compaction method (HCM), normally used for sandy soils, for compacting fly ash deposit. Measurements of soil performance and cone penetration tests before and after the compaction were carried out, indicating obvious effects on soil properties and strength increase in the improved ground. It has been found that HCM introduces three-dimensional (3D) nonuniformity in the upper part, versus horizontally uniform layers in the lower part of the improved ground. Also found is that the HCM-induced vertical soil strain is almost proportional to the ratio of cone resistance increment to the prior-treatment cone resistance in the uniform zones.]]></description>
      <pubDate>Tue, 24 Jul 2012 09:11:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1140769</guid>
    </item>
    <item>
      <title>Identifying Performance Patterns in New Mexico Bridges</title>
      <link>https://trid.trb.org/View/1125925</link>
      <description><![CDATA[Optimal choices for new bridge designs and existing bridge maintenance strategies necessitate understanding how bridge attributes and their interactions affect the performance of bridges in different environments. Analysis of a bridge inventory database will make it possible to recognize patterns of performance and how these patterns relate to different bridge attributes. One major challenge in performing this analysis is to determine a set of bridge performance features with minimum uncertainties and consistent records in the database. This paper describes the analytical investigations performed in searching for bridge performance features and their patterns as observed from the bridge inventory database of the State of New Mexico, USA. The use of hierarchical clustering made it possible to classify the data while also creating a rule-base scheme to come to findings. This analysis showed certain material types and structure types to be prevalent in either high performing groups or low performing groups.]]></description>
      <pubDate>Wed, 04 Jan 2012 13:14:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/1125925</guid>
    </item>
    <item>
      <title>Lessons from the Tendering of Railway Services in Sweden. Are Some Contracts Better than Others?</title>
      <link>https://trid.trb.org/View/1102700</link>
      <description><![CDATA[Regional public transportation authorities (PTAs) are responsible for providing non-commercial railroad services in Sweden. Subsidized railroad service patronage has increased by 4.6 percent annually during the last two decades in spite of substantial real fare increases. The authors address the organization of the responsibility for public transportation in order to provide an understanding of patronage increases. Tendering process and contracting format design are organizational features that differ across PTAs since there is no streamlining. It is difficult to determine whether one specific contract design better contributes to sector performance since specific contract data is patchy and partly incomparable. An understanding of how sector internal performance affects traffic growth therefore cannot be based on a rigorous analysis. The authors argue that in order for waste to be reduced, it is necessary to voluntarily or forcibly implement a system for performance assessment.]]></description>
      <pubDate>Wed, 25 May 2011 14:33:34 GMT</pubDate>
      <guid>https://trid.trb.org/View/1102700</guid>
    </item>
    <item>
      <title>Unsealed Gravel Road Management Systems Programming and Data Management</title>
      <link>https://trid.trb.org/View/1092198</link>
      <description><![CDATA[This paper summarizes the processes a programmer or data manager should go through when assisting with implementing or upgrading an unsealed gravel roads management system (GRMS).  It describes the process of getting critical inputs from gravel road managers, the initial and ongoing inputs to a GRMS, the algorithms that should be used to analyze data inputs, and database structures for storing and managing the information needed to operate a GRMS.  A cyclic maintenance scheduling procedure, triggered maintenance programs and network-level outputs, such as financial tables and performance assessments, are described.  Issues relating to how gravel roads data are collected are discussed, particularly the effects of gathering data for accountants rather than for engineers.  To address this issue, eight dirt and gravel road maintenance tasks are proposed.]]></description>
      <pubDate>Wed, 20 Apr 2011 14:03:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/1092198</guid>
    </item>
    <item>
      <title>Evaluation of Fleet Road Safety Interventions</title>
      <link>https://trid.trb.org/View/1092738</link>
      <description><![CDATA[Work related road traffic fatalities are the largest cause of work fatalities in the UK.  It is estimated that 25% of UK road accidents involve someone driving for work.  This risk profile makes fleet safety an important topic for study as it can have a significant impact on the overall road toll, and on worker safety.  Although many regulations relate to the operation of large trucks and buses there are fewer special regulations for those driving for work in other contexts.  Fleet risk management has traditionally focused on cost control rather than employee and public safety although this has been changing.  Studies have shown that changing behaviors in both drivers and the rest of the organization can make a large improvement in outcomes.  This study has unique access to the detailed insurance claims data from a large UK telecoms fleet of approximately 40,000 vehicles since 2001 and information on interventions applied to manage this risk.  A range of interventions have been applied to claim reduction which are based on published work.  Interventions include driver training, building safety into management performance metrics and risk assessments yet it is unclear as to which intervention shows most or any impact on safety outcomes.  This study outlines these actions and quantifies the effectiveness of driver training using a statistical modeling approach. The complex data represents a wide range of vehicle types (e.g. trucks and white vans and personal cars) which could be used for work related journeys, commuting or pleasure.  Performance is shown to be statistically significant reduction in collisions after exposure to training. Although data consistency issues have obscured the investigation, this study has shown that management strategies and the safety culture are worthy investments]]></description>
      <pubDate>Mon, 21 Mar 2011 14:14:03 GMT</pubDate>
      <guid>https://trid.trb.org/View/1092738</guid>
    </item>
    <item>
      <title>Driving Difficulties in Parkinson's Disease</title>
      <link>https://trid.trb.org/View/1082101</link>
      <description><![CDATA[This article reviews the evidence on driving difficulties that may be associated with Parkinson’s disease and other disorders that affect the coordination of attention, perception, memory, motor and executive functions (including decision-making).  The authors maintain that age or medical diagnosis alone are often unreliable criteria for licensure or withdrawing licensure.  Preferably, decisions on fitness to drive should be based on empirical observations of performance.  Assessment of fitness-to-drive can be achieved by testing cognitive abilities (measured by neuropsychological tasks) and driving skills (using driving simulators).  In addition, natural observations of the driver in instrumented vehicles, can help determine fitness-to-drive.  The authors describe multipurpose field research vehicles known as the Automobile for Research in Ergonomics and Safety (ARGOS) and Nissan-Iowa Instrumented Research Vehicle of Advanced Neuroergonomic Assessment (NIRVANA).  These vehicles have been designed to examine objective indices of driving performance in normal and potentially unfit drivers and to assess the safety and usability of prototype automotive technologies.  The authors also call for more research on the patterns of driver safety errors that cause crashes.  With this type of data, interventions could be designed to reduce these errors and injuries and increase mobility.  Interventions could include driver performance monitoring devices, collision alerting and warning systems, road design, and graded licensure strategies.]]></description>
      <pubDate>Wed, 15 Dec 2010 08:57:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/1082101</guid>
    </item>
  </channel>
</rss>