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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>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Neue Generation Eurocode 2 für Brücken. Erarbeitung und Validierung nationaler Parameter und Erstellung eines DIN-Handbuchs</title>
      <link>https://trid.trb.org/View/2452535</link>
      <description><![CDATA[Für die Bemessung und Konstruktion von Betonbrücken müssen Planende mehrere Regelwerksdokumente gemeinsam berücksichtigen. Bereits für die 1. Generation der Eurocodes wurden auf Initiative des Bundesverkehrsministeriums Handbücher mit allen für den Brückenbau relevanten Regelungen aus den Eurocodes und den gleichzeitig zu beachtenden nationalen Festlegungen im Rahmen eines Forschungsprojekts erstellt. Nun soll für die 2. Generation des Eurocode 2 (Bemessung und Konstruktion von Stahlbeton- und Spannbetontragwerken) ein Handbuch, das die Regelungen für die Bemessung und Konstruktion von Betonbrücken in konsolidierter Form enthält, erarbeitet werden. Im Rahmen des Projekts sollen Vorschläge für die Festlegung erforderlicher, national zu definierender Parameter sowie erforderlicher ergänzender Regelungen für den Betonbrückenbau auf Grundlage wirkungsorientierter Forschung erarbeitet werden. Des Weiteren sollen die durch den DIN-Spiegelausschuss (SPA) „Betonbrücken“ verabschiedeten Regelungen inklusive ergänzender Regelungen im DIN-Handbuch „Betonbrücken“ zusammengeführt werden. ABSTRACT IN ENGLISH: For the design and construction of concrete bridges, planners must consider several code documents together. At the initiative of the Federal Ministry of Transport, manuals containing all the regulations from the Eurocodes relevant to bridge construction and the national specifications to be observed at the same time have already been compiled for the 1st generation of the Eurocodes as part of a research project. Now a handbook containing the regulations for the design and construction of concrete bridges in consolidated form is to be compiled for the 2nd generation of Eurocode 2 (Design of concrete structures). The objectives of the project are the development of proposals for the specification of necessary parameters to be defined nationally as well as necessary supplementary regulations for concrete bridge construction on the basis of impact-orientated research. Furthermore, the consolidation of the regulations adopted by the DIN mirror committee (SPA) “Concrete bridges” including supplementary regulations in the DIN manual “Concrete bridges”.
]]></description>
      <pubDate>Wed, 13 Nov 2024 02:53:22 GMT</pubDate>
      <guid>https://trid.trb.org/View/2452535</guid>
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    <item>
      <title>Performance-Based Decision Making for Asset Management: Lessons Learned and Practitioner Toolkit</title>
      <link>https://trid.trb.org/View/2071708</link>
      <description><![CDATA[Governments, including transportation agencies, are increasingly adopting performance-based approaches to management and decision making to help achieve desired outcomes, and to encourage fiscal responsibility, accountability and transparency in governance.  As financial resources become more limited and governments focus on obtaining value for money, transportation agencies are increasingly required to make investments using cross-asset trade-offs and optimization methods to improve transparency and credibility using a performance-based approach to decision making.  Despite recent progress, there is still much to learn about performance-based decision making and the best techniques to ensure success. Many public transportation agencies seek practical examples and tools that could be deployed to advance their asset management practices, improve the transparency of decision making, and optimize network investments. This report helps close that knowledge gap by synthesizing lessons learned with respect to performance-based decision making, and by developing a toolkit that can help practitioners identify tools to implement for different needs within the asset management process.]]></description>
      <pubDate>Tue, 29 Nov 2022 14:14:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2071708</guid>
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      <title>Geometric Design Guide for Canadian Roads: Chapter 11 - Special Roads</title>
      <link>https://trid.trb.org/View/2071707</link>
      <description><![CDATA[The Geometric Design Guide for Canadian Roads contains the current design and human factors research and practices for roadway geometric design. It replaces the 1999 edition of the Guide and subsequent revisions. The Guide provides guidance to planners and designers in developing design solutions that meet the needs of a range of users while addressing the context of local conditions and environments. The Guide is organized into chapters to cover the entire design process from design philosophy and roadway classification to design parameters and specific guidelines for the safe accommodation of vehicles, cyclists and pedestrians on linear road elements and at intersections. Chapter 11-Special Roads provides design guidance for special roads such as low-volume rural roads, resource roads, recreational roads, and winter roads. A summary of road surface characteristics and their impact on alignments and vehicles is included for reference. The chapter includes discussion on two-lane two-way roads, one-lane two-way roads, and one-lane one-way roads, and is to be used in conjunction with other chapters in this guide. Guidance for roadside safety for low-volume roads is included.]]></description>
      <pubDate>Tue, 29 Nov 2022 14:14:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2071707</guid>
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      <title>British Columbia Active Transportation Design Guide</title>
      <link>https://trid.trb.org/View/1754876</link>
      <description><![CDATA[As part of the Province’s CleanBC plan to build a better future for all British Columbians, the British Columbia Active Transportation Design Guide helps transform how we get around in a way that preserves dignity, reduces pollution and leads to better health outcomes, while making communities cleaner and more liveable. The Design Guide is the first of its kind to be adopted by a provincial government in Canada. The Design Guide is a comprehensive set of planning and engineering guidelines offering recommendations for the planning, selection, design, implementation, and maintenance of active transportation facilities for communities of all sizes. It brings together engineering principles and best practices from the municipal, provincial, national, and international levels.  The Design Guide incorporates theory, recent research, design concepts, best practices, new methodologies, and innovations to maximize the benefits of investing in active transportation infrastructure. Universal access is included as the fundamental design criteria for all active transportation infrastructure design, ensuring that any facility intended for walking, cycling or other human-powered transport can be accessed by individuals of all ages and abilities.]]></description>
      <pubDate>Tue, 01 Dec 2020 13:57:58 GMT</pubDate>
      <guid>https://trid.trb.org/View/1754876</guid>
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    <item>
      <title>Add Traffic Signal Head Phasing Diagram to Reduce Connection Errors and to Improve Safety</title>
      <link>https://trid.trb.org/View/1754871</link>
      <description><![CDATA[Traffic signals are becoming more and more complicated nowadays. Traditionally traffic engineers will design the intersection based on traffic count data, field observation, and accident history and warrant analysis. Then drafters will draw the phasing diagram/construction/Traffic Signals for this intersection. Technologists will then implement timing plans and databases based on the drafts. Then the timing plan/database will be handed into signal installers. During all this process, if one chain is broken, then traffic signal safety and operation can be in hazardous situation. The proper application and design of the traffic signal is a key component in improving the safety and efficiency of the intersection. To remove all the uncertainness, a Traffic Signal Head Phasing Diagram will clarify unnecessary confusion.  Signal phasing is the sequence of individual signal phases or combinations of signal phases within a cycle that define the order in which various pedestrian and vehicular movements are assigned the right-of-way. While intersections are becoming more complicated, more functions/phases/movement are needed to adapt to different vehicle and pedestrian requirement, complicated phase sequences and signal head setup come along with it. Following are a few examples, including Dallas Left-Turn Display for Left-Turn Lead-Lag Signal Phasing, Diamond Interchange, Right-Turn vehicle phase overlap, pedestrian phases in a wide intersection that covers two consecutive vehicle phases. Traditional simple signal head design without clear designation may not work well for these complex situations. The solution is to draw a Traffic Signal Head Phasing Diagram/Notation.  The diagram can be drawn in existing traffic signal diagram, just by adding a few more signal head diagrams, with some notations on the side explaining the phase number or overlap number for that signal head. Or a table can be drawn to explain which color in Signal head is driven by which phase or overlap. It sounds like a simple improvement, but for large intersections this process will simplify the guessing process by installers, make engineer/drafter's job much clear, and also make the installers’ job much easier and reduce the risk of wrong connections.  The signal head phasing diagram can avoid unnecessary guesses from traffic professionals, provide a much clearer image of the operation of the controllers and traffic signal indications. One image is worth more than a thousand words!]]></description>
      <pubDate>Tue, 01 Dec 2020 13:57:50 GMT</pubDate>
      <guid>https://trid.trb.org/View/1754871</guid>
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    <item>
      <title>Guide canadien de conception géométrique des routes : Chapitre 4 – Éléments du profil en travers</title>
      <link>https://trid.trb.org/View/1657708</link>
      <description><![CDATA[Le Guide canadien de conception géométrique des routes fait état de la recherche et des pratiques actuelles en matière de conception et de facteurs humains aux fins de la conception géométrique des routes. Il remplace l’édition de 1999 et les mises à jour subséquentes. Le Guide offre une orientation aux planificateurs et aux concepteurs pour le développement de solutions de conception qui répondent aux besoins d’une variété d’usagers tout en abordant la question des conditions et des environnements locaux. Des lignes directrices pour la conception d’autoroutes, d’artères, de routes collectrices et de routes locales, tant en milieu urbain qu’en milieu rural, sont incluses de même que pour des aménagements intégrés pour les cyclistes et les piétons.  Le Guide est réparti en dix chapitres afin de couvrir le processus complet de conception depuis la philosophie de conception à la classification des routes, les paramètres de conception, et les lignes directrices spécifiques pour l’aménagement sécuritaire des véhicules, des cyclistes et des piétons sur les éléments linéaires de la route et aux carrefours. Les chapitres sont : philosophie de la conception; contraintes, classification et uniformité de la conception; configuration des tracés et des voies; éléments des profils en travers; conception intégrée pour cyclistes; conception intégrée pour piétons; conception des abords de route; accès; carrefours; et échangeurs.  Chapitre 4 – Éléments du profil en travers fournit des indications sur les procédures de conception et sur les domaines de définition des profils en travers et de leurs éléments connexes, y compris l’utilisation de voies spéciales, d’accotements, de terre-pleins centraux et latéraux, de banquettes, de bordures, de caniveaux et de drainage. On y traite également des ponts et de l’utilisation partagée de l’emprise par les services publics, du stockage de la neige et de l’élargissement futur des routes; une série de profils en travers types y sont également présentés.]]></description>
      <pubDate>Mon, 07 Oct 2019 14:55:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1657708</guid>
    </item>
    <item>
      <title>Traffic Monitoring Practices Guide for Canadian Provinces and Municipalities</title>
      <link>https://trid.trb.org/View/1511368</link>
      <description><![CDATA[The Traffic Monitoring Practices Guide for Canadian Provinces and Municipalities (Guide) provides the first national-level guidance on the planning, design, and implementation of traffic monitoring programs for Canadian provinces and municipalities.  The primary objectives of the Guide are to promote uniformity in the approach and techniques used to deliver traffic monitoring programs in Canada and to improve the quality of the traffic data provided by these programs.  The scope of the Guide encompasses all functions within a traffic monitoring program, namely: program design and evaluation, data collection, data analysis, and reporting traffic data. Separate guidance is provided for motorized and non-motorized modes. The Guide also addresses the unique issues and challenges associated with monitoring interrupted traffic flow conditions, which are common in urban environments. It is intended for use by transportation professionals involved in the planning, design, implementation, and management of traffic monitoring programs for provincial and municipal agencies in Canada. Professionals whose responsibilities involve the application of traffic data are also expected to benefit from this Guide.]]></description>
      <pubDate>Thu, 03 May 2018 15:14:54 GMT</pubDate>
      <guid>https://trid.trb.org/View/1511368</guid>
    </item>
    <item>
      <title>Tema Vintermodell: etapp 3: dokumentation av programkod</title>
      <link>https://trid.trb.org/View/1492588</link>
      <description><![CDATA[The "Vintermodellen" is a software tool to help form strategies for winter road maintenance. The present document is intended to serve as a support for future development of Vintermodellen (the Winter Model). No manual has been written before as the computer program "vintermodellen" is exclusively used within VTI. The Matlab implementation of the Vintermodellen computer program was written from January 2013 to March 2014. A substantial part of the work presented in the present document was to restructure the code, and move in-data from the Matlab code to spreadsheets (Excel files). The presentation starts with some basics facts which are important to consider when running the "vintermodellen" Matlab program. In chapter 6—8 the Matlab code is described in general terms. The presentation ends with the different ways to export the results. The Swedish Transport Administration owns the Vintermodellen and is responsible for the development. The Vintermodellen is administered by VTI by direction of the Swedish Transport Administration.]]></description>
      <pubDate>Tue, 19 Dec 2017 11:30:53 GMT</pubDate>
      <guid>https://trid.trb.org/View/1492588</guid>
    </item>
    <item>
      <title>Geometric Design Guide for Canadian Roads: Chapter 4 - Cross Section Elements</title>
      <link>https://trid.trb.org/View/1483917</link>
      <description><![CDATA[The Geometric Design Guide for Canadian Roads contains the current design and human factors research and practices for roadway geometric design. It replaces the 1999 edition of the Guide and subsequent revisions. The Guide provides guidance to planners and designers in developing design solutions that meet the needs of a range of users while addressing the context of local conditions and environments. Design guidelines for freeways, arterials, collectors, and local roads, in both urban and rural locations are included as well as guidance for integrated bicycle and pedestrian design.  The Guide is organized into ten chapters to cover the entire design process from design philosophy and roadway classification to design parameters and specific guidelines for the safe accommodation of vehicles, cyclists and pedestrians on linear road elements and at intersections. The chapters are: Design Philosophy; Design Controls, Classification and Consistency; Alignment and Lane Configuration; Cross Section Elements; Bicycle Integrated Design; Pedestrian Integrated Design; Roadside Design; Access; Intersections; and Interchanges.  Chapter 4 – Cross Section Elements provides guidance on design procedures and domains related to cross sections and related elements including special purpose lanes, shoulders, medians, outer separations and boulevards, curb and gutter and drainage. Considerations for bridges and utility placement, snow storage and future widening are discussed and a series of typical cross sections are provided.]]></description>
      <pubDate>Thu, 28 Sep 2017 12:26:50 GMT</pubDate>
      <guid>https://trid.trb.org/View/1483917</guid>
    </item>
    <item>
      <title>Geometric Design Guide for Canadian Roads: Chapter 3 - Alignment and Lane Configuration</title>
      <link>https://trid.trb.org/View/1483916</link>
      <description><![CDATA[The Geometric Design Guide for Canadian Roads contains the current design and human factors research and practices for roadway geometric design. It replaces the 1999 edition of the Guide and subsequent revisions. The Guide provides guidance to planners and designers in developing design solutions that meet the needs of a range of users while addressing the context of local conditions and environments. Design guidelines for freeways, arterials, collectors, and local roads, in both urban and rural locations are included as well as guidance for integrated bicycle and pedestrian design.  The Guide is organized into ten chapters to cover the entire design process from design philosophy and roadway classification to design parameters and specific guidelines for the safe accommodation of vehicles, cyclists and pedestrians on linear road elements and at intersections. The chapters are: Design Philosophy; Design Controls, Classification and Consistency; Alignment and Lane Configuration; Cross Section Elements; Bicycle Integrated Design; Pedestrian Integrated Design; Roadside Design; Access; Intersections; and Interchanges.  Chapter 3 – Alignment and Lane Configuration focuses on the design procedures and domains associated with horizontal and vertical alignment, the coordination of these two design elements and related issues including: cross slopes, lane widening, balance and continuity and specialized traffic lanes such as truck climbing lanes, passing lanes and truck escape ramps.]]></description>
      <pubDate>Thu, 28 Sep 2017 12:26:47 GMT</pubDate>
      <guid>https://trid.trb.org/View/1483916</guid>
    </item>
    <item>
      <title>Geometric Design Guide for Canadian Roads: Chapter 2 - Design Controls, Classification and Consistency</title>
      <link>https://trid.trb.org/View/1483915</link>
      <description><![CDATA[The Geometric Design Guide for Canadian Roads contains the current design and human factors research and practices for roadway geometric design. It replaces the 1999 edition of the Guide and subsequent revisions. The Guide provides guidance to planners and designers in developing design solutions that meet the needs of a range of users while addressing the context of local conditions and environments. Design guidelines for freeways, arterials, collectors, and local roads, in both urban and rural locations are included as well as guidance for integrated bicycle and pedestrian design.  The Guide is organized into ten chapters to cover the entire design process from design philosophy and roadway classification to design parameters and specific guidelines for the safe accommodation of vehicles, cyclists and pedestrians on linear road elements and at intersections. The chapters are: Design Philosophy; Design Controls, Classification and Consistency; Alignment and Lane Configuration; Cross Section Elements; Bicycle Integrated Design; Pedestrian Integrated Design; Roadside Design; Access; Intersections; and Interchanges.  Chapter 2 – Design Controls, Classification and Consistency discusses how design controls such as human factors, speed, design vehicles and sight lines influence geometric design. The chapter also includes guidance for classifying links in a road network to provide for a hierarchical and readily understood road system that properly serves different purposes. The principles of providing consistency in cross section, operating speed and driver workload are outlined in this chapter.]]></description>
      <pubDate>Thu, 28 Sep 2017 12:26:44 GMT</pubDate>
      <guid>https://trid.trb.org/View/1483915</guid>
    </item>
    <item>
      <title>Geometric Design Guide for Canadian Roads: Chapter 1 - Design Philosophy</title>
      <link>https://trid.trb.org/View/1483914</link>
      <description><![CDATA[The Geometric Design Guide for Canadian Roads contains the current design and human factors research and practices for roadway geometric design. It replaces the 1999 edition of the Guide and subsequent revisions. The Guide provides guidance to planners and designers in developing design solutions that meet the needs of a range of users while addressing the context of local conditions and environments. Design guidelines for freeways, arterials, collectors, and local roads, in both urban and rural locations are included as well as guidance for integrated bicycle and pedestrian design. The Guide is organized into ten chapters to cover the entire design process from design philosophy and roadway classification to design parameters and specific guidelines for the safe accommodation of vehicles, cyclists and pedestrians on linear road elements and at intersections. The chapters are: Design Philosophy; Design Controls, Classification and Consistency; Alignment and Lane Configuration; Cross Section Elements; Bicycle Integrated Design; Pedestrian Integrated Design; Roadside Design; Access; Intersections; and Interchanges.  Chapter 1-Design Philosophy provides an introduction to the design objectives, its evolving approach and the design domain concept utilized throughout the Guide. Guidance on benefit cost analysis, value engineering and design exceptions is also provided.]]></description>
      <pubDate>Thu, 28 Sep 2017 12:26:41 GMT</pubDate>
      <guid>https://trid.trb.org/View/1483914</guid>
    </item>
    <item>
      <title>Canadian Roundabout Design Guide</title>
      <link>https://trid.trb.org/View/1483886</link>
      <description><![CDATA[In recent years, a proliferation of roundabouts has been observed throughout Canada. To date, there is no single source of guidance about the design, construction, operation, and maintenance of roundabouts that is available to Canadian practitioners. Therefore, practitioners have been using guidance from a variety of sources including the guidelines from other countries. The Canadian Roundabout Design Guide is intended to provide information and guidance related to the planning, design, construction, operation, maintenance and safety of roundabouts in Canada. The Guide serves as a companion to the Geometric Design Guide for Canadian Roads, providing direction specific to the application and design of roundabouts.]]></description>
      <pubDate>Thu, 28 Sep 2017 12:24:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/1483886</guid>
    </item>
    <item>
      <title>Establishing the Minimum Ground Clearances for the TAC Design Vehicles Based on the Desirable Grades and the Maximum Grade Changes</title>
      <link>https://trid.trb.org/View/1434854</link>
      <description><![CDATA[The TAC Geometric Design Guide for Canadian Roads (GDGCD) 1999 describes the turning characteristics of design vehicles using turning templates. Vehicle turning templates play an integral role in controlling the horizontal aspects of the geometric design of intersections. As to the vertical aspect of a design, design vehicles are ignored primarily because no information is provided on the vehicle’s ground clearances nor the pitch and roll limitations at the vehicle’s articulating points. Hence, vertical profiles are not typically evaluated against the standard design vehicles in practice, but instead it is assumed that the maximum recommended grades and grade changes for the vertical alignments presented in the design guideline will accommodate the vehicles. With ground clearance values implied, designers cannot easily perform checks to ensure the vertical profiles that deviate from the guidelines will accommodate the design vehicles. This may lead to potential vehicle hang-up conflicts at driveways, rail crossings, and roundabout truck aprons. This study is focused on establishing the ground clearances for the GDGCD design vehicles so that they can be incorporated into future guidelines. The ground clearance for 8 of the design vehicles is calculated as a function of the recommended grades in the GDGCD and verified against 3D vehicle simulation software. A more comprehensive study involving surveying the existing vehicle inventory in Canada to establish these ground clearance values is recommended but is not covered in the scope of this study.]]></description>
      <pubDate>Tue, 15 Nov 2016 16:52:15 GMT</pubDate>
      <guid>https://trid.trb.org/View/1434854</guid>
    </item>
    <item>
      <title>Development of an Unplanned Road Closure Protocol for the New Brunswick Provincial Highway System</title>
      <link>https://trid.trb.org/View/1434835</link>
      <description><![CDATA[A formalized road closure protocol is an important operational directive used by provincial departments of transportation to address closures to traffic for severe weather conditions and other unplanned events. It ensures coordinated and effective action by the response agencies to control a required highway closure and ensure a safe, successful outcome.  Recent winter events demonstrate the need for highway closure protocols. Major bridge damage or destruction, fire, flooding, earthquakes, landslides, snow avalanche, hazardous material spills or cargo and/or vehicle cleanup are also examples of events where emergency highway closing protocols can be applied. In response, the New Brunswick Department of Transportation and Infrastructure (NBDTI) undertook a study to develop a provincial highway closure protocol for unplanned events. This paper presents findings from this study that involved a review of NBDTI’s current practices, stakeholder consultations, a jurisdictional scan and preparation of a protocol and procedures document.  Both the stakeholder consultations and jurisdictional scan were particularly important. The consultations identified needs, current challenges and potential solutions with those stakeholders impacted by unplanned road closures. The jurisdictional scan focused on current practices, policies, and procedures used by other provincial departments of transportation across Canada, including those with multiple highway maintenance service providers. The scan captured current practices with respect to the scope protocol/procedures, approval process, closure actions, re-opening processes, stakeholder roles and formalized documentation. These findings will be of interest to many organizations, especially with the advent of social media to communicate information to road users. The study culminated in the preparation of a provincial protocol and procedures for unplanned highway closures, in consultation with NBDTI. The protocol included defining NBDTI and stakeholder agency roles and the processes/procedures for making the decision to close a highway, implementing the closure, communicating the closure and reopening the highway.]]></description>
      <pubDate>Tue, 15 Nov 2016 16:50:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/1434835</guid>
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