<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=PHNlYXJjaD48cGFyYW1zPjxwYXJhbSBuYW1lPSJkYXRlaW4iIHZhbHVlPSJhbGwiIC8+PHBhcmFtIG5hbWU9InN1YmplY3Rsb2dpYyIgdmFsdWU9Im9yIiAvPjxwYXJhbSBuYW1lPSJ0ZXJtc2xvZ2ljIiB2YWx1ZT0ib3IiIC8+PHBhcmFtIG5hbWU9ImxvY2F0aW9uIiB2YWx1ZT0iMCIgLz48L3BhcmFtcz48ZmlsdGVycz48ZmlsdGVyIGZpZWxkPSJpbmRleHRlcm1zIiB2YWx1ZT0iJnF1b3Q7RGF0YSB0YWJsZXMmcXVvdDsiIG9yaWdpbmFsX3ZhbHVlPSImcXVvdDtEYXRhIHRhYmxlcyZxdW90OyIgLz48L2ZpbHRlcnM+PHJhbmdlcyAvPjxzb3J0cz48c29ydCBmaWVsZD0icHVibGlzaGVkIiBvcmRlcj0iZGVzYyIgLz48L3NvcnRzPjxwZXJzaXN0cz48cGVyc2lzdCBuYW1lPSJyYW5nZXR5cGUiIHZhbHVlPSJwdWJsaXNoZWRkYXRlIiAvPjwvcGVyc2lzdHM+PC9zZWFyY2g+" 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>California Traffic Safety Survey 2018: Data Analysis and Comparison with 2010-2017 Survey Data Results</title>
      <link>https://trid.trb.org/View/2635329</link>
      <description><![CDATA[The 2018 California Traffic Safety Study is the ninth wave of a statewide representative survey of California vehicle drivers on traffic safety perceptions, distracted driving and level of awareness of traffic safety media outreach campaigns. The following data analysis is based on 1,395 survey responses collected in August and September of 2018. The analyzed data only include the valid answers for survey items, while excluding all reported “Don’t know” responses as well as response refusals. For this reason, the valid percentage of responses differs for each question due to the number of valid answers given to a particular question. The total answer per survey question is reflected in the total number of completed surveys, which are listed in each table. In addition, some questions are skipped based on selected answer and the sample sizes for each survey item vary accordingly. Due to rounding to one decimal point, some percentages presented do not always add up to the exact value of 100.0%. All comparisons to previous years’ data refer to the comparable longitudinal field surveys conducted with California vehicle drivers since 2010. The scope and overall sample size of the 2018 survey was comparable to the sample size of the 2017 data collection. In total, 1,395 vehicle drivers were intercepted for the study, resulting in an overall confidence interval of +/- 2.63, at a confidence level of 95%.]]></description>
      <pubDate>Sat, 28 Feb 2026 17:17:58 GMT</pubDate>
      <guid>https://trid.trb.org/View/2635329</guid>
    </item>
    <item>
      <title>User's Guide for the Public Use Tapes 1983-1984 Nationwide Personal Transportation Study: Part 1</title>
      <link>https://trid.trb.org/View/2582032</link>
      <description><![CDATA[This report is part of a series that presents findings from the 1983-1984 Nationwide Personal Transportation Study (NPTS). This report explains the 1983 NPTS data collection, coding, and tabulation procedures. It includes a section that compares the 1983 Study with the 1969 and 1977 studies and procedures for achieving comparability among the three studies. This part of the report, Part 1, contains the body of the report and Appendix A: Sample Tables.]]></description>
      <pubDate>Sun, 09 Nov 2025 18:10:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582032</guid>
    </item>
    <item>
      <title>User’s Guide for the Public Use Tapes 1983-1984 Nationwide Personal Transportation Study: Part 2</title>
      <link>https://trid.trb.org/View/2582033</link>
      <description><![CDATA[This report is part of a series that presents findings from the 1983-1984 Nationwide Personal Transportation Study (NPTS). This report explains the 1983 NPTS data collection, coding, and tabulation procedures. It includes a section that compares the 1983 Study with the 1969 and 1977 studies and procedures for achieving comparability among the three studies. This part of the report, Part 2, contains Appendix B: 1983 NPTS Record Layout and Documentation.]]></description>
      <pubDate>Sun, 09 Nov 2025 18:10:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582033</guid>
    </item>
    <item>
      <title>User's Guide for the Public Use Tapes 1983-1984 Nationwide Personal Transportation Study: Part 3</title>
      <link>https://trid.trb.org/View/2582115</link>
      <description><![CDATA[This report is part of a series that presents findings from the 1983-1984 Nationwide Personal Transportation Study (NPTS). This report explains the 1983 NPTS data collection, coding, and tabulation procedures. It includes a section that compares the 1983 Study with the 1969 and 1977 studies and procedures for achieving comparability among the three studies. This part of the report, Part 3, contains the following appendices: Appendix C: Glossary of Terms; Appendix D: 1983 NPTS Study Questionnaire; Appendix E: Occupation Classification System Codes; Appendix F: Industrial Classification System Industry Codes; Appendix G: NPTS Public Use Information; and Appendix H: Urban Areas With and Without Rail.]]></description>
      <pubDate>Sun, 09 Nov 2025 18:10:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582115</guid>
    </item>
    <item>
      <title>Special Report Financial Management Study for the Texas Highway Department and the U.S. Department of Commerce Bureau of Public Roads, January 1, 1966: Vol. II</title>
      <link>https://trid.trb.org/View/2588964</link>
      <description><![CDATA[This is Volume II of a special report of the results of a financial management study of the Texas Highway Department.]]></description>
      <pubDate>Sat, 25 Oct 2025 16:41:08 GMT</pubDate>
      <guid>https://trid.trb.org/View/2588964</guid>
    </item>
    <item>
      <title>Statistical Characteristics of Storm Interevent Time, Depth, and Duration for Eastern New Mexico, Oklahoma, and Texas</title>
      <link>https://trid.trb.org/View/2570811</link>
      <description><![CDATA[The design of small runoff-control structures, from simple floodwater-detention basins to sophisticated best-management practices, requires the statistical characterization of rainfall as a basis for cost-effective, risk-mitigated, hydrologic engineering design. The U.S. Geological Survey, in cooperation with the Texas Department of Transportation, has developed a framework to estimate storm statistics including storm interevent times, distributions of storm depths, and distributions of storm durations for eastern New Mexico, Oklahoma, and Texas. The analysis is based on hourly rainfall recorded by the National Weather Service. The database contains more than 155 million hourly values from 774 stations in the study area. Seven sets of maps depicting ranges of mean storm interevent time, mean storm depth, and mean storm duration, by county, as well as tables listing each of those statistics, by county, were developed. The mean storm interevent time is used in probabilistic models to assess the frequency distribution of storms. The Poisson distribution is suggested to model the distribution of storm occurrence, and the exponential distribution is suggested to model the distribution of storm interevent times. The four-parameter kappa distribution is judged as an appropriate distribution for modeling the distribution of both storm depth and storm duration. Preference for the kappa distribution is based on interpretation of L-moment diagrams. Parameter estimates for the kappa distributions are provided. Separate dimensionless frequency curves for storm depth and duration are defined for eastern New Mexico, Oklahoma, and Texas. Dimension is restored by multiplying curve ordinates by the mean storm depth or mean storm duration to produce quantile functions of storm depth and duration. Minimum interevent time and location have slight influence on the scale and shape of the dimensionless frequency curves. Ten example problems and solutions to possible applications are provided.]]></description>
      <pubDate>Mon, 01 Sep 2025 16:31:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/2570811</guid>
    </item>
    <item>
      <title>Results of Physical Tests of Road-Building Aggregate</title>
      <link>https://trid.trb.org/View/2406648</link>
      <description><![CDATA[This bulletin gives the results of tests on samples of ledge rock, crushed stone, gravel, blast-furnace or smelter slag, and natural or manufactured fine aggregate which were made by the Bureau of Public Roads to January 1, 1951. This bulletin supersedes Miscellaneous Publication No. 76 of the U. S. Department of Agriculture, The Results of Physical Tests of Road-Building Rock, and supplements the data in that bulletin. The geographical distribution of the more than 13,000 samples is shown in table 1. The results of tests on more than 9,700 samples of coarse aggregate are reported in table 10 (beginning on p. 12) and on over 3,400 samples of fine aggregate in table 11 (beginning on p. 170). In both tables, the test results are arranged in alphabetical order by State, county, and nearest town.]]></description>
      <pubDate>Sat, 27 Jul 2024 12:11:36 GMT</pubDate>
      <guid>https://trid.trb.org/View/2406648</guid>
    </item>
    <item>
      <title>Tabulated chemistry method for fast calculations of detailed chemical kinetics in system level simulations of internal combustion engines</title>
      <link>https://trid.trb.org/View/2366307</link>
      <description><![CDATA[To reduce the emissions from internal combustion engines, new combustion strategies along with alternate fuels blends are currently under investigation. The engine performance and emissions depend primarily on the chemical reactions occurring inside the engine. However, the modeling of reactions in engine simulation models using a detailed reaction mechanism is computationally very expensive, especially for very large mechanisms. Hence, a tabulated chemistry solver is developed in this work to reduce the computational time. The thermochemical states of the mixture are pre-calculated at different engine operating conditions based on homogeneous reactor simulations and stored in a lookup table which can be interpolated during the engine simulations. The present work introduces a novel method for thermochemical mapping between detailed chemistry and tabulated chemistry along with automatic identification of important intermediate species during table generation. The evolution of the thermochemical state of the mixture is described using a progress variable and its derivative. Different progress variables are investigated, and a novel formulation is proposed. The method is then applied to predict the reactions and knock phenomenon as well as the emissions in spark-ignited engines. The results using the tabulated chemistry are in good agreement with the detailed chemistry. The crank angle at the knock onset is predicted with a root-mean-squared error of 0.6 degrees crank angle. The cylinder pressure and temperature are in excellent agreement with the full detailed chemistry solution. The concentration of emissions (CO, NOₓ etc.) are also in good agreement for a wide range of engine operating conditions. The tabulated chemistry method provided a speedup of ~750 times as compared to detailed chemistry for a mechanism with 679 species. The computational time of the tabulated chemistry method remains constant and independent of the mechanism size. The method can be applied to large parametric studies for engine design, optimization, and calibration.]]></description>
      <pubDate>Thu, 23 May 2024 10:09:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/2366307</guid>
    </item>
    <item>
      <title>Nested column generation for split pickup vehicle routing problem with time windows and time-dependent demand</title>
      <link>https://trid.trb.org/View/2317513</link>
      <description><![CDATA[This study attempts to solve a split pickup vehicle routing problem with time windows and time-dependent demand. This is a vehicle routing problem in which demand is generated at different constant rates for different customers, and vehicles are allowed to pick up demand during the demand generation process. In this problem, the pickup time determines the quantity of demand that can be picked up, and a partial pickup is permitted during a single visit. The problem is formulated into a mixed-integer nonlinear programming model and a sequence-extended network is designed to represent the relationship between multiple pickups. Because of the interdependences of time, load, and cost in the pricing subproblem, the classic labelling algorithm with weak dominance rules is ineffective, therefore, a nested column generation-based branch-and-price-and-cut algorithm is proposed to tackle the problem. The nested structure allows these trade-offs to be resolved in a lower-level column generation, and it can be applied to other interdependent routing problems. The computational results show that the proposed algorithm is effective in obtaining optimal solutions for small- and medium-scale instances within a reasonable time limit.]]></description>
      <pubDate>Wed, 01 May 2024 09:46:36 GMT</pubDate>
      <guid>https://trid.trb.org/View/2317513</guid>
    </item>
    <item>
      <title>Highway Statistics Summary to 1955</title>
      <link>https://trid.trb.org/View/2317833</link>
      <description><![CDATA[This bulletin provides a general historical summary of information dealing with highways, their use, and financing, thus bringing together under one cover a comprehensive statistical review of highway development in the United States through 1955. It includes all of the data presented in "Highway Statistics, Summary to 1945," thereby replacing that publication, and adds thereto most of the material published since then in the "Highway Statistics" annual bulletins. The material is presented in five major groupings. The motor-fuel section includes analyses of motor-fuel consumption, tax rates, and tax receipts. The section on motor vehicles includes tables on motor-vehicle registrations and operators' licenses, their fee schedules, and the revenues received therefrom and from motor-carrier taxes; also included in this section are travel, loading, and speed data. The highway finance section covers the disposition of highway-user imposts, receipts and expenditures for highways, and highway debt; because of the interest in the subject, data for toll facilities are segregated. Although the local finance historical series are not presented separately in this bulletin, combined State and local government finance data are reported in several series of tables. The mileage section reports road and street mileage existing, and the mileage built each year, classified by system and by type. The section on Federal aid includes tables on Federal excise taxes and on Federal-aid funds, construction, and system mileage.]]></description>
      <pubDate>Sat, 06 Jan 2024 11:10:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2317833</guid>
    </item>
    <item>
      <title>Toll Facilities in the United States: Bridges, Ferries, Tunnels, Roads as of January 1, 1976</title>
      <link>https://trid.trb.org/View/2305301</link>
      <description><![CDATA[In this publication are presented selected data on highway toll facilities in the United States in operation, under construction, or proposed at the beginning of 1976. Table T-1 lists all known toll facilities in operation, under construction, or financed as of January 1, 1976. Table T-2 lists those projects considered to be under serious consideration, awaiting completion of financing arrangements. Table T-3 lists proposals for new toll projects that may or may not become realities, depending upon such factors as legislative approval, financial feasibility, completion of plans, etc. For each of these facilities is reported, to the extent known, the name, financing or operating authority, ownership, location and termini, feature crossed, length, road system, and--for facilities located on the National System of Interstate and Defense Highways--the Interstate System route number.]]></description>
      <pubDate>Mon, 11 Dec 2023 11:36:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2305301</guid>
    </item>
    <item>
      <title>Toll Bridges and Toll Tunnels in the United States as of December 31, 1938</title>
      <link>https://trid.trb.org/View/2305438</link>
      <description><![CDATA[Facts and figures included in the following tables have been compiled from the best available data. In many instances it has been difficult to obtain authentic information due chiefly to the condition of existing records. Until the information is verified the tables are presented in preliminary form only. The data are arranged in two tables. Table 1 describes the location of the facility and gives the one-way toll rates. Table 2 lists the structural features and items of ownership. The bridges and tunnels are listed according to their local names and by States in alphabetical order. Reference numbers are used to indicate their approximate locations on the enclosed map of the United States.]]></description>
      <pubDate>Mon, 11 Dec 2023 11:36:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2305438</guid>
    </item>
    <item>
      <title>Toll Ferries in the United States as of December 31, 1940</title>
      <link>https://trid.trb.org/View/2306915</link>
      <description><![CDATA[The following tables, arranged in three sections, cover operating toll ferries in the United States as of December 31, 1940. Various sources of information were utilized in the preparation of the tables and while the facts and figures are considered to be reasonably accurate their use does not constitute an endorsement by the Public Roads Administration . Section 1 covers the location of the ferry, body of water crossed, highway route, road system, and toll rates. Section 2 covers the ferry terminals, number of boats usually operated, capacity of boats, overhead clearance, load limit, and operating schedules. Section 3 covers the ownership, name and address of owner, year services started, boats owned, reported cost, and traffic.]]></description>
      <pubDate>Mon, 11 Dec 2023 11:36:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2306915</guid>
    </item>
    <item>
      <title>Toll Ferries in the United States as of December 31, 1938</title>
      <link>https://trid.trb.org/View/2306920</link>
      <description><![CDATA[The following list or toll ferries operating in the United States as of December 31. 1938 has been compiled from the best available information. Owing to the condition of many of the records the data here presented are submitted in preliminary form only, subject to verification. Ferries included in this report are those operating between fixed terminal points for the chief purpose or transporting motor vehicles, although they may also carry foot passengers and freight. The data are arranged in two tables. Table 1 describes the location of the facility and lists the one-way toll rates. Table 2 gives information on the service provided at individual crossings and items of ownership. The last column of this table refers to the average capacity. in number of vehicles. of boats normally assigned to a particular crossing and does not cover all vessels of the owner. The column "Number of boats owned" refers to all vessels owned irrespective of how they may be distributed among various crossings.]]></description>
      <pubDate>Mon, 11 Dec 2023 11:36:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2306920</guid>
    </item>
    <item>
      <title>Toll Facilities in the United States: Bridges, Ferries, Tunnels, Roads as of January 1, 1968</title>
      <link>https://trid.trb.org/View/2306916</link>
      <description><![CDATA[In this publication are presented selected data on highway toll facilities in the United States in operation, under construction, or proposed at the beginning of 1968. Table T-1 lists all known toll facilities in operation or under construction as of January 1, 1968. Table T-2 lists those projects considered to be under serious consideration, awaiting completion of financing arrangements. Table T-3 lists proposals for new toll projects that may or may not become realities, depending upon such factors as legislative approval, financial feasibility, completion of plans, etc.]]></description>
      <pubDate>Mon, 11 Dec 2023 11:36:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2306916</guid>
    </item>
  </channel>
</rss>