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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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>Customer-Oriented Open Data for Accessible Transit: A Case Study in Contra Costa County</title>
      <link>https://trid.trb.org/View/2689384</link>
      <description><![CDATA[This report presents a set of proposed open data specifications for the development of an Operational Data Portal (ODP) to support customer-oriented “smart” apps for travelers with special needs, particularly seniors and people with disabilities, in Contra Costa County. The ODP would aggregate and organize data from various mobility service providers, individual riders, and community organizations to be accessed by software developers of digital trip planners, trip booking and scheduling services, passenger feedback mechanisms, and service performance evaluation tools. The report concludes that the establishment of an open data platform along with supporting applications will improve the rider-experience and facilitate operating efficiency and coordination among accessible transit providers. It recommends further research to align the proposed data specifications with emerging transportation data standards, enhance the integration of unstructured data, and develop inclusive systems for customers with limited access to smart devices.]]></description>
      <pubDate>Mon, 13 Apr 2026 16:48:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2689384</guid>
    </item>
    <item>
      <title>Transportation System Direct Loss Exceedence Analysis and Subsystem Reliability under Retrofit Action</title>
      <link>https://trid.trb.org/View/2263825</link>
      <description><![CDATA[This paper introduces an efficient method for quantifying the impact of bridge retrofit on subsystem reliability and risk to transportation networks. This study also demonstrates the significant influence of ground motion and damage correlations in quantifying the benefits of mitigation. These concepts are illustrated through a case study for an existing transportation subsystem in Contra Costa County, California. After retrofit of critical components, a mean direct loss reduction of 50% and an increase in network reliability of 40% is achieved for the 475 year return period. Incorporating statistical dependence in ground motions and bridge damage resulted in a wide band of uncertainty. Bounds on subsystem failure associated with a 1% annual rate of exceedence decreased from 2.5% – 8% to 1.2% – 5.5% after retrofit of critical bridges. While the relative importance of critical bridges to subsystem reliability was sensitive to seismological parameters and statistical dependence, the subset of bridges identified as critical were consistent in all cases.]]></description>
      <pubDate>Mon, 09 Feb 2026 08:39:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2263825</guid>
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    <item>
      <title>What Transportation Systems Management &amp; Operations (TSMO) Means to My Local Transportation Agency</title>
      <link>https://trid.trb.org/View/2205290</link>
      <description><![CDATA[As agencies look to more innovative and customer-focused ways to maximize the efficiency and reliability of the existing transportation system while balancing other important factors such as environmental sustainability, livability, and equity, Transportation Systems Management and Operations (TSMO) has become more important than ever as an overarching philosophy that local agencies are embracing. Representatives from the City of Madison in Wisconsin, USA; Monmouth County in New Jersey, USA; the Contra Costa Transportation Authority (CCTA) in California, USA; and Houston TranStar in Texas, USA were interviewed to discuss what TSMO means to each agency and how TSMO efforts are helping them achieve their agency goals and better serve the traveling public. Each agency was asked five questions. Their respective answers are presented in this article.]]></description>
      <pubDate>Mon, 17 Jul 2023 15:13:22 GMT</pubDate>
      <guid>https://trid.trb.org/View/2205290</guid>
    </item>
    <item>
      <title>Decarbonizing regional multi-model transportation system with shared electric charging hubs</title>
      <link>https://trid.trb.org/View/2036115</link>
      <description><![CDATA[In light of the growing concerns of global climate change, the pace of transportation electrification has greatly accelerated in recent years as an effort towards net-zero greenhouse gas (GHG) emissions. However, it remains unclear how to effectively deploy and operate public charging infrastructure to best serve an electrified transportation system within a multi-modal context while maximizing the benefits of decarbonization. This is especially true when considering the GHG emitted by generating one kWh of electricity, i.e. the electricity carbon intensity, varies across a day due the change of generation mix between renewable and fossil fueled resources. To address this question, the authors propose a mechanism of shared charging hubs that can provide holistic energy management for both electric buses (EBs) and passenger electric vehicles (EVs). The deployment and operation of shared charging hubs is determined by a new spatio-temporal optimization model which aims to minimize GHG emission given a budget limit while avoiding the occurrence of massive spikes in peak power demand. This is achieved by coherently accommodating the charging demand of EBs and EVs, and explicitly integrating the time-varying electricity carbon intensity and vehicle-to-grid (V2G) technology. To demonstrate its effectiveness, the model is applied to the bus fleets operated by seven transit agencies and the park-and-ride facilities (for EVs) near twelve rail transit stations in Contra Costa County, California, USA. The results show that the shared charging hubs can lead to significant GHG emission reduction while mitigating the peak electricity demand. This research will help policymakers and transportation agencies make more informed decisions regarding the planning and design of charging infrastructure.]]></description>
      <pubDate>Wed, 16 Nov 2022 11:36:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2036115</guid>
    </item>
    <item>
      <title>Power Trips: Early Understanding of Preparedness and Travel Behavior During California Public Safety Power Shutoff Events</title>
      <link>https://trid.trb.org/View/1933928</link>
      <description><![CDATA[Recent wildfire risks in California have prompted the implementation of public safety power shutoff (PSPS) events, procedures enacted by utility operators to deenergize parts of the electrical grid and reduce the likelihood of wildfire ignition. Despite their yearly occurrence, PSPS events are severely understudied, and little is known about how these events affect disaster preparation activity, travel behavior, and transportation systems. With growing wildfire risks in North America and beyond, PSPS events require immediate and thorough research to reduce their negative externalities and maximize their benefits. This exploratory study employs survey data from East Bay Hills residents in Alameda and Contra Costa counties in California who were affected by two PSPS events in October 2019 (n?=?210). Through descriptive statistics and basic discrete choice models for the decision to conduct typical or changed travel, this research contributes to the literature as the first assessment of PSPS event travel behavior. We found that travel did not change drastically during the event, although respondents conducted a high number of preparedness activities. A sizable portion of the sample conducted extended trips during the PSPS event days, whereas a small number evacuated to a destination overnight. Respondents received relatively clear information from multiple communication methods, indicating substantial information about the events. Modeling results found that power loss was a driver in travel behavior change, whereas demographics indicated heterogeneous responses within the sample. The paper concludes with a discussion of key takeaways and suggestions for research in this nascent field.]]></description>
      <pubDate>Mon, 28 Mar 2022 16:52:15 GMT</pubDate>
      <guid>https://trid.trb.org/View/1933928</guid>
    </item>
    <item>
      <title>The Impact of COVID-19 on the Mobility Needs of an Aging Population in Contra Costa County</title>
      <link>https://trid.trb.org/View/1776740</link>
      <description><![CDATA[In 2018, SafeTREC conducted a survey on transportation mobility issues among older adults in California. A follow-up survey planned for 2020, just as the COVID-19 pandemic changed life for all residents, was redesigned to assess mobility needs and changes during the Shelter-in-Place order and focused on COVID-19 impacts. Results indicate that the COVID-19 pandemic and subsequent Shelter-in-Place order have had a major impact on senior mobility. Communications for many were restricted to phone, email, texts, social media and video chats. Among those with a medical problem, just over 60% called a doctor or nurse line or went to a doctor’s office, while 11.2% went to an emergency room, and 8.6% did nothing. A total of 8% of respondents said they had run out of food or other important items during the Shelter-in-Place order. Rates of exercise outside the home dropped 20% between January and June 2020, and while over 60% sought outside entertainment in January 2020, by June 2020, nearly 70% accessed their entertainment online at home. Almost 80% of working respondents feared spreading or contracting COVID-19 because of their work or related transportation. Almost 20% felt a lack of companionship or closeness sometimes or often. Over 30% were worried about their current or long-term finances. A total of 84.5% strongly agreed or agreed that the Shelter-in-Place order was necessary. None of the respondents to the follow-up survey were diagnosed with COVID-19, and 88.2% were not concerned about risk of exposure from any member of their household.]]></description>
      <pubDate>Sun, 28 Feb 2021 16:52:19 GMT</pubDate>
      <guid>https://trid.trb.org/View/1776740</guid>
    </item>
    <item>
      <title>Crossing That Bridge Later: Installing a Critical Water Pipeline over an Existing Bridge without Modifications</title>
      <link>https://trid.trb.org/View/1639113</link>
      <description><![CDATA[The Diablo Water District (district) is located in the northeastern part of Contra Costa County (county), in Northern California. One of the largest areas of anticipated growth for the District is on Bethel Island, a 5.6 square-mile island in the San Francisco Bay Delta area that is expected to grow from its current population of 2,200 residents to over 7,000 residents by 2040. In 2009, the County rebuilt the single, aging bridge that connects Bethel Island to the mainland with a new 900 ft long concrete bridge. As part of the planning for the bridge, the county allowed the district to reserve space within the bridge structure for construction of a future water pipeline with one restriction—no modifications would be allowed to the bridge during future water line installation. Growth within the district is driven and funded by development; because development was not active on the island in 2009, the district could not support the full predesign of a future water pipeline and could only give conservative guidance to the county in preparation for a future pipeline. In 2013, the district began working with a land developer to plan for a new 500-unit development on the island. The development was to be connected to the District’s main distribution system via a new 18-inch water pipeline over the Bethel Island Bridge. This paper discusses the design conditions considered for the pipeline: thermal expansion and contraction of the pipeline, differential seismic displacements between the pipeline and bridge, ground settlement at the bridge abutments, pipeline stability and flexibility, and overall constructability—all of which had to comply with the county’s requirement of “no bridge modifications”. The paper concludes with some lessons learned during construction.]]></description>
      <pubDate>Fri, 21 Feb 2020 17:25:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/1639113</guid>
    </item>
    <item>
      <title>Development and Field Testing of An Integrated Dynamic Transit Operation System (IDTO)</title>
      <link>https://trid.trb.org/View/1630198</link>
      <description><![CDATA[This report documents the research efforts to the design and development of an Integrated Dynamic Transit Operation System for suburban transit operations. The key concepts and operational scenarios for IDTO are specified based on the system requirements, and the IDTO system architecture is designed as an information system, along with the key functional components. An IDTO system is intended to enable TCONNECT, T-DISP and D-RIDE services and real-time transit information for transit operations and travelers. Under this project, a prototype IDTO system has been implemented and tested. The IDTO prototype system which includes the IDTO server, a dispatch interface and a traveler mobile app has been field tested and demonstrated with respect to a number of Tri-Delta Transit bus routes and BART routes connecting at identified points, with a special focus on the implementation and test of T-CONNET application. Data collected from the field operational test has been analyzed to obtain the key findings in terms of system performance, benefits and impacts of IDTO operations. The test results indicate that IDTO can effectively detect trip delays, reduce travel time and meet passengers’ needs in real-time.]]></description>
      <pubDate>Thu, 31 Oct 2019 17:02:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/1630198</guid>
    </item>
    <item>
      <title>Assessing and Addressing the Mobility Needs of an Aging Population</title>
      <link>https://trid.trb.org/View/1605055</link>
      <description><![CDATA[The mobility needs of an aging population is one of the most substantial challenges facing California in the coming decades. The number of residents age 65 and older is expected to double between 2012 and 2050, and the number age 85 and above is expected to increase by over 70% between 2010 and 2030. Declines in physical function related to age may reduce mobility options dramatically. A survey of 510 residents age 55 and older in Contra Costa County was conducted to determine mobility patterns and limitations related to age and other factors. Results of the survey indicate that a majority of seniors are car dependent. However, some older adults miss important activities due to mobility limitations associated with increasing age, poorer health, living alone, not having a licensed driver in the household, and having a disability. Mobility options are also limited in some geographic areas and demographic groups. Importantly, older adults want to “age in place.” Based on these findings and those in related studies, the travel options and the quality of life for older adults, now and in the future, can be greatly enhanced if efforts are made to develop mobility solutions beyond use of private vehicles. The findings support the recommendations of recent regional plans such as the Coordinated Public Transit–Human Services Transportation Plan (2018), adopted by the Metropolitan Transportation Commission (MTC) of the San Francisco Bay Area, which recommends supporting a range of mobility options centered around shared mobility and accessibility for populations at risk for limited mobility.]]></description>
      <pubDate>Fri, 14 Jun 2019 09:49:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/1605055</guid>
    </item>
    <item>
      <title>HOT Lane Simulation Tools</title>
      <link>https://trid.trb.org/View/1532565</link>
      <description><![CDATA[This report describes the simulation model and software for freeway corridors with High-Occupancy Vehicle (HOV) and High-Occupancy or Tolled (HOT) lanes, and the model calibration methodology. In the course of this project a simulation framework for freeways with managed lanes was developed around the Berkeley Advanced Traffic Simulator (BeATS). It was tested with freeway segments of I-680 North (full access HOV lane), I-210 East (limited access HOV lane) and I-10 West (limited access HOT lane). Test examples show, the simulation can adequately reproduce traffic behavior in the presence of multiple vehicle classes and managed lane facilities. Model calibration guidelines are provided.This project is an important step in the development of the open source software package for operations planning in multimodal transportation networks.]]></description>
      <pubDate>Fri, 21 Sep 2018 09:35:13 GMT</pubDate>
      <guid>https://trid.trb.org/View/1532565</guid>
    </item>
    <item>
      <title>An analytical model to conduct a person-based evaluation of transit preferential treatments on signalized arterials</title>
      <link>https://trid.trb.org/View/1508739</link>
      <description><![CDATA[The complexities of urban transportation networks where multiple modes with different characteristics and needs travel in combination with constraints on space and funding make the sustainable management of these systems a challenge. In order to improve transit service, space (e.g., dedicated bus lanes) and time (e.g., transit signal priority strategies) Transit Preferential Treatments (TPT) are deployed to improve transit operations. The objective of this paper is to develop an analytical model that allows for a person-based evaluation of alternative TPTs when considered individually and in combination. In particular, the analytical model is developed to assess person delay and person discharge flow at any intersection that is part of a signalized arterial, where auto arrivals are in platoons. The performance of TPTs is evaluated using both the analytical model and through microsimulation tests on two intersections of San Pablo Avenue in Berkeley, CA. Space TPTs such as dedicated bus lanes and queue jumper lanes are beneficial in reducing bus person delay when provided in addition to the existing lanes; however, the effectiveness of time TPTs such as green extension depends on the level of auto demand in combination with signal settings. Changes in person discharge flow are not significant for any of the treatments tested with the exception of the bus lane substitution with and without green extension, which led to a significant decrease in person discharge flow. Increased bus frequency increases the effectiveness of transit signal priority in reducing total and bus person delay. The analytical model results produce ranking outcomes that are comparable with the microsimulation ones and therefore, the model may be used for a quantitative evaluation of TPTs without the need for data intensive and time consuming calibration efforts required for microsimulation models. The developed model can be used to guide infrastructure and investment decisions on where such TPTs should be implemented and under what conditions space TPTs should be combined with time TPTs to improve person mobility.]]></description>
      <pubDate>Thu, 17 May 2018 14:45:56 GMT</pubDate>
      <guid>https://trid.trb.org/View/1508739</guid>
    </item>
    <item>
      <title>Drones, artificial intelligence creep into road construction</title>
      <link>https://trid.trb.org/View/1481603</link>
      <description><![CDATA[]]></description>
      <pubDate>Wed, 06 Sep 2017 09:56:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/1481603</guid>
    </item>
    <item>
      <title>Development and Demonstration for Integrated Dynamic Transit Operations System (IDTO)</title>
      <link>https://trid.trb.org/View/1441780</link>
      <description><![CDATA[The task will develop a fully functional Integrated Dynamic Transit Operation (IDTO) prototype system that builds upon Dynamic Traveler information, several dynamic operations, including dynamic demand responsive transit operations, Dynamic Dispatch (T-DISP) and Connection Protection (T-CONNECT). T-DISP will allow public transit to be responsive to public needs by enabling the transit agency and the public to communicate with each other. T-CONNECT will ensure that the public will be able to transfer from one transit agency to another (i.e. between buses) even if a system is running ahead or behind schedule. This prototype IDTO will be tested and demonstrated in a full scale test site in East Contra Costa County of the San Francisco East Bay operated by Tri-Delta Transit.]]></description>
      <pubDate>Wed, 04 Jan 2017 10:52:15 GMT</pubDate>
      <guid>https://trid.trb.org/View/1441780</guid>
    </item>
    <item>
      <title>Let’s take a vote on that</title>
      <link>https://trid.trb.org/View/1344885</link>
      <description><![CDATA[The Contra Costa Transportation Authority (CCTA) in California frequently takes suggestions from the public into account when planning for transportation. CCTA gathers ideas from users through social media and an interactive website. Public input will be included in the Countywide Transportation Plan, with some ideas being included in the Transportation Expenditure Plan. Suggestions from the public help CCTA identify what changes are most needed. The county has deployed a number of improvements to benefit travelers during peak periods and is working on technologies that can further advance their systems, increasing mobility.]]></description>
      <pubDate>Mon, 02 Mar 2015 10:19:36 GMT</pubDate>
      <guid>https://trid.trb.org/View/1344885</guid>
    </item>
    <item>
      <title>The Effects of Transportation Corridor Features on Driver and Pedestrian Behavior and on Community Vitality: Final Study Report</title>
      <link>https://trid.trb.org/View/1278741</link>
      <description><![CDATA[Complete Streets elements such as enhanced pedestrian crossings and bicycle facilities influence a transportation corridor's safety, mobility and economic vitality. A framework of performance measures for bicyclist and pedestrian safety and mobility and environmental sustainability was developed for the California Department of Transportation (Caltrans) to gauge the effectiveness of such measures. Field testing of the proposed measures for validity and reliability was conducted on key urban arterial highways, San Pablo Avenue on the east side of the San Francisco Bay Area and Santa Monica Boulevard in Los Angeles. Street design features, injury and fatality rates, and user perceptions of safety and mobility were analyzed and baseline data were gathered from a portion of Highway 82 in San Jose. Of the 23 proposed measures, 19 were deemed valid and four were determined to need further testing. Among the conclusions: Caltrans should collect pedestrian and bicyclist volumes and crash rates; Complete Streets design features attract all user groups and contribute to economic vitality; increased mobility and perceived safety can be achieved for all user groups; policies and plans have a positive effect on the design of highway corridors; and, Caltrans must exercise care to maximize safety and comfort for all road users.]]></description>
      <pubDate>Fri, 11 Jul 2014 09:27:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/1278741</guid>
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