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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>
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      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>Intelligent Sensor Integration on Rural Multi-Modal System [supporting dataset]</title>
      <link>https://trid.trb.org/View/2620567</link>
      <description><![CDATA[The Tahoe Transportation District (TTD) and regional partners are seeking to enhance transportation safety and mobility along key corridors in the Lake Tahoe Basin. The roadway network entering, traveling within, and leaving the Tahoe Basin lacks the infrastructure required to acquire real-time and historical traffic and congestion data. This pilot project aims to support TTD and the regional partners in collecting accurate count data at each of the seven entry/exit points of the Tahoe Basin and along the Truckee/US80/SR267/SR89 roadways. The project is designed to plan, prototype, test, and evaluate a limited deployment of a data collection sensor infrastructure to gather transportation and traveler-related information. The goal is to integrate this information into a single cloud-based open source or interface for reporting and management. This information will be utilized by TTD, Tahoe Regional Planning Agency (TRPA), partners, commuters, and travelers within the Tahoe Basin and adjoining areas to provide an integrated infrastructure for collecting vehicle data. This data will be incorporated into a database for various stakeholders. Furthermore, the project will establish the framework for long-term data collection across the region and integrate multiple transportation data sources for efficient use by partner agencies. It will propel the region toward real-time parking availability for motorists and improve the ease of transit use, walking, and bicycling. Other long-term uses include sharing information about weather hazards, closures, construction, or crashes.]]></description>
      <pubDate>Tue, 25 Nov 2025 16:57:37 GMT</pubDate>
      <guid>https://trid.trb.org/View/2620567</guid>
    </item>
    <item>
      <title>Intelligent Sensor Integration on Rural Multi-Modal System: Data Management Plan</title>
      <link>https://trid.trb.org/View/2620566</link>
      <description><![CDATA[The Tahoe Transportation District (TTD) and regional partners are seeking to enhance transportation safety and mobility along key corridors in the Lake Tahoe Basin. The roadway network entering, traveling within, and leaving the Tahoe Basin lacks the infrastructure required to acquire real-time and historical traffic and congestion data. This pilot project aims to support TTD and the regional partners in collecting accurate count data at each of the seven entry/exit points of the Tahoe Basin and along the Truckee/US80/SR267/SR89 roadways. The project is designed to plan, prototype, test, and evaluate a limited deployment of a data collection sensor infrastructure to gather transportation and traveler-related information. The goal is to integrate this information into a single cloud-based open source or interface for reporting and management. This information will be utilized by TTD, Tahoe Regional Planning Agency (TRPA), partners, commuters, and travelers within the Tahoe Basin and adjoining areas to provide an integrated infrastructure for collecting vehicle data. This data will be incorporated into a database for various stakeholders. Furthermore, the project will establish the framework for long-term data collection across the region and integrate multiple transportation data sources for efficient use by partner agencies. It will propel the region toward real-time parking availability for motorists and improve the ease of transit use, walking, and bicycling. Other long-term uses include sharing information about weather hazards, closures, construction, or crashes.]]></description>
      <pubDate>Tue, 25 Nov 2025 16:57:37 GMT</pubDate>
      <guid>https://trid.trb.org/View/2620566</guid>
    </item>
    <item>
      <title>Snow Creek Stream and Wetland Restoration Project</title>
      <link>https://trid.trb.org/View/2270489</link>
      <description><![CDATA[The Snow Creek Steam and Wetland Restoration Project, located in the Lake Tahoe Basin, CA, was substantially completed in the fall of 2000. This 1.9 hectare (4.7 acre) restoration project, built on property owned by the California Tahoe Conservancy (CTC), included the removal of 20,000 cu. meters of fill, the re-establishment of a pond, the Construction of two seasonal wetlands, and 360 lineal meters of new wetland channels. Fill had been placed in the wetlands in the 1960s to create a staging area for California Department of Transportation (Caltrans) road crews, resulting in the disturbance of the wetland system as well as the creation of a pond. A major component of the project was the removal of the fill. The project required cooperation of numerous agencies operating under the regulatory environment of the Lake Tahoe Basin. It combined several disciplines, including civil engineering, hydrology, hydraulics, fisheries, wetland restoration, and erosion control. Approximately 1,500 sq. meters of wetland sod were salvaged and re-planted. 4,500 wetland plugs, propagated from seed collected on site, were planted. Over 100 willow clumps were salvaged and re-planted, and an innovative propagated wetland mat was installed along the three new channels north of State Highway 28, and a new channel south of the highway. A temporary irrigation system was installed to insure plant establishment. The Contractor will maintain the main portion of the project for two full growing seasons. The CTC and California Conservation Corps crews built the restored channel between Highway 28 and Lake Tahoe.]]></description>
      <pubDate>Tue, 20 Feb 2024 15:55:54 GMT</pubDate>
      <guid>https://trid.trb.org/View/2270489</guid>
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    <item>
      <title>Estimating Sediment Losses Generated from Highway Cut and Fill Slopes in the Lake Tahoe Basin</title>
      <link>https://trid.trb.org/View/1488357</link>
      <description><![CDATA[Lake Tahoe’s famed water clarity has gradually declined over the last 50 years, partially as a result of fine sediment particle (FSP, < 16 micrometers in diameter) contributions from urban stormwater. Of these urban sources, highway cut and fill slopes often generate large amounts of sediment due to their steep, highly-disturbed nature. Therefore, understanding the erosion mechanisms (rainfall-runoff and dry ravel), the magnitude of erosion rates and the particle-size distribution (PSD) of the eroded material from these highly disturbed slopes, as well as quantifying the load reductions achieved through slope stabilization practices, is critical to reducing sediment contributions to Lake Tahoe. Furthermore, accurate predictions of soil losses from these cut and fill slopes are required to establish baseline sediment loadings, assess the effectiveness of slope stabilization improvements and track the progress towards achieving Total Maximum Daily Load (TMDL) reduction milestones in the Lake Tahoe Basin. The Revised Universal Soil Loss Equation (RUSLE), Tahoe Basin Sediment Model (TBSM) and the Road Cut and Fill Slope Sediment Loading Assessment Tool (RCAT) are the most common soil erosion models used to predict sediment yields from disturbed slopes in the Lake Tahoe Basin; however, limited comparisons of the predictions from the various models to actual field data exist. The primary objectives of this research were to (1) design and construct an inexpensive rainfall simulator capable of closely replicating the kinetic energy of natural rainfall and operating over steep terrain; (2) use rainfall simulation data collected from a diverse set of 25 slopes adjacent to highways in the Lake Tahoe Basin to evaluate the predictive performance of the erosion models and determine significant correlations between the physical plot characteristics and the collected runoff and erosion data; (3) provide suggestions to improve the predictive performance of the models; and (4) use field measurements of dry ravel to quantify sediment yields and develop predictive equations to estimate this erosion phenomena. The comprehensive correlation analyses of the rainfall simulation data indicated that surface cover, of all the physical characteristics of the slope site, most directly influenced the magnitude of erosion. In terms of broad comparisons, the slopes with volcanic soils (sandy loams) typically generated greater amounts of runoff and erosion than the slopes with granitic soils (sand and loamy sands) and exhibited finer particle size fractions in the bulk soil and runoff, resulting in four to ten times greater amounts of FSP soil losses for comparable slopes. The fill slopes appeared to exhibit more noticeable and less predictable variations in the measured runoff and erosion parameters, presumably due to the unique characteristics of these slopes (e.g., foreign soil material, increased soil compaction and decreased surface roughness). Using the Nash-Sutcliffe Model efficiencies (R²eff) to evaluate the predictive performance of the selected models, the R²eff for the TBSM and RCAT were negative for both the total and FSP soil loss predictions, indicating that the mean of the observed soil losses from the rainfall simulations predicted the soil losses better than the TBSM and RCAT models. Conversely, the RUSLE model performed best in predicting both total soil losses (R²eff = 0.20) and FSP soil losses (R²eff = 0.16). The RUSLE performed most accurately in predicting the largest FSP sediment yields, while the TBSM performed best in predicting the smaller FSP sediment yields. Some potential improvements to the various sediment loss models include: using the bulk soil characteristics to estimate the FSP fraction of the runoff erosion (RUSLE), incorporating a slope-length factor to increase erosion rates on longer slopes (RCAT) and refine model soil parameters using calibration techniques and the soil, runoff and erosion data collected from the rainfall simulations performed during this research (TBSM). The dry ravel collected from the field traps indicated that sediment yields are primarily slope dependent and may significantly increase when slope gradients exceed approximately 60%. Additionally, the PSD analyses revealed that the amount of fines in the bulk soil was similar to the amount in the dry ravel collected from the sediment traps (1:1 ratio), thus differing from the ratio of the FSP fraction observed during the rainfall simulation erosion and the FSP fraction of the bulk soil (1:5:1).]]></description>
      <pubDate>Mon, 20 Nov 2017 16:45:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/1488357</guid>
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    <item>
      <title>Analysis of the effectiveness of control measures to mitigate road dust emissions in a regional network</title>
      <link>https://trid.trb.org/View/1136702</link>
      <description><![CDATA[The effectiveness of control measures to reduce road dust emissions is analyzed using a year's data of road dust emissions collected with a mobile sampling platform and a survey of road maintenance practices in the Lake Tahoe Basin of Nevada and California US. Attributes such as sweeping practices, anti-icing, shoulder improvement, pavement condition, trackout, and abrasive material from road segments were analyzed with a feature subset selection algorithm. Street sweeping was found to be an effective means of controlling dust emissions from roads. Road dust from dirty tertiary roads served as a continuous source of suspendable material for adjacent high-speed roads in the winter time. To be most effective, emission control strategies require that not only primary roads, but all roads, be swept after snow storms to recover applied abrasive material.]]></description>
      <pubDate>Wed, 25 Apr 2012 14:21:01 GMT</pubDate>
      <guid>https://trid.trb.org/View/1136702</guid>
    </item>
    <item>
      <title>Driver/Pedestrian Behavior at Marked and Unmarked Crosswalks in the Tahoe Basin</title>
      <link>https://trid.trb.org/View/919885</link>
      <description><![CDATA[This report summarizes results from field observations of driver and pedestrian behavior at marked and unmarked crosswalks at uncontrolled crossings during the summer months in the Tahoe Basin of California. Some 27 percent of all U.S. pedestrian fatalities occurred in rural areas in 2007. Previous studies in urban and suburban areas note that pedestrians show greater caution -- looking both says, hurrying across the street, watching for gaps in traffic -- when crossing in unmarked crosswalks. The authors conclude that behavior trends identified in previous urban/suburban Bay Area studies are largely similar in a rural/recreational context. The multiple threat variable, however, is detected less frequently for observed multi-lane roads at Tahoe than those in San Francisco, perhaps because of lower traffic volumes at the four-lane crosswalks.]]></description>
      <pubDate>Wed, 28 Jul 2010 07:15:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/919885</guid>
    </item>
    <item>
      <title>Driver and Pedestrian Behavior at Uncontrolled Crosswalks in Tahoe Basin Recreation Area of California</title>
      <link>https://trid.trb.org/View/910821</link>
      <description><![CDATA[For more than 30 years, pedestrian safety studies have considered pedestrian–vehicle collision patterns and pedestrian and driver behavior at marked and unmarked crosswalks at uncontrolled crossings. Recent research in this area, conducted by the University of California, Berkeley, Traffic Safety Center on behalf of the California Department of Transportation (Caltrans), was designed to fill key gaps in the literature by analyzing driver and pedestrian behavior and knowledge of right-of-way laws for marked and unmarked crosswalks. The Caltrans study, as with most previous crosswalk studies, focused on urban and suburban areas (in this case, the San Francisco, California, Bay Area), where driver and pedestrian characteristics do not change significantly from day to day. After this study came the recognition that similar research was needed in rural and recreational locations, where the population frequently changes. As such, this paper summarizes results from field observations of driver and pedestrian behavior at marked and unmarked crosswalks at uncontrolled crossings during the summer in the Tahoe Basin of California. This study, also funded by Caltrans, concludes that the behavior trends identified in the study of urban and suburban areas in the Bay Area are largely similar in a rural and recreational context. This finding is significant for Caltrans, a statewide agency that is seeking to provide a consistent crosswalk installation and treatment policy for its facilities across California. Other regional and state agencies may similarly benefit from the findings of the study.]]></description>
      <pubDate>Fri, 19 Feb 2010 10:57:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/910821</guid>
    </item>
    <item>
      <title>Roadside Erosion Control and Revegetation Needs Associated with the Use of De-Icing Salt within the Lake Tahoe Basin</title>
      <link>https://trid.trb.org/View/836648</link>
      <description><![CDATA[The two major objective of the study include the development of an assessment and quantification of the deicing salt related effects to trees and other vegetation adjacent to the highways of the Lake Tahoe Basin, as well as an assessment of roadside erosion control/revegetation needs on lands that may have been impacted by deicing salt. The study area includes approximately 64.2 miles of highway alignment on both the California and Nevada side of the Lake Tahoe Basin. Approximately 27.9miles of the study are located along the California highways including State Routes (SR) 28 and 89 and U.S. Highway 50. The remaining 36.3 miles of the study are located along the Nevada highways including SR 28, 207, and 431 and U.S. Highway 50.]]></description>
      <pubDate>Mon, 22 Oct 2007 09:58:05 GMT</pubDate>
      <guid>https://trid.trb.org/View/836648</guid>
    </item>
    <item>
      <title>Small-Scale Studies on Low Intensity Chemical Dosing (LICD) for Treatment of Highway Runoff</title>
      <link>https://trid.trb.org/View/784348</link>
      <description><![CDATA[The overall goal of this project was to determine the feasibility of low intensity chemical dosing (LICD) for improving highway storm water runoff quality in the Lake Tahoe Basin. A primary objective was to identify promising coagulant chemistries for turbidity and phosphorus reduction that could be tested further in small-scale and full-scale pilots. This project combined literature reviews, laboratory studies (charge titration and jar test experiments using synthetic and actual storm water runoff) and settling column studies to assess treatment performance and feasibility. The goal of this effort was to test a broad range of coagulants (which represent a broad range of chemistries) and determine their overall effectiveness and their robustness to variations in environmental and operational factors.]]></description>
      <pubDate>Fri, 21 Jul 2006 14:34:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/784348</guid>
    </item>
    <item>
      <title>CHARACTERISTICS OF SNOWMELT RUNOFF FROM HIGHWAYS IN THE TAHOE BASIN AND TREATMENT INVESTIGATIONS FOR IMPROVING RUNOFF QUALITY</title>
      <link>https://trid.trb.org/View/746616</link>
      <description><![CDATA[To reduce the current trend of decreasing water clarity of Lake Tahoe, the California Regional Water Control Board's Lahontan Region imposed numeric discharge limits for five pollutants (total nitrogen, total phosphorus, total iron, turbidity, and oil and grease) for both surface water and infiltration discharges in the Tahoe basin.  To assess its compliance with these discharge limits, the California Department of Transportation (Caltrans) monitored six representative sites for snowmelt and other storm water runoff from summer 2000 through spring 2003.  In addition, Caltrans has investigated several existing double-barrel sand traps for their effectiveness in removing pollutants and complying with the Tahoe basin discharge limits.  The results obtained to date indicate that (a) concentrations of pollutants found in the snowmelt runoff are higher than the specified storm water discharge limits; (b) double-barrel sand traps were capable of capturing sand and sediment, but the capture was not complete; (c) particles that range from 100 to 2,000 microns represented the highest proportion, but no correlation was found between particles and chemical concentrations; and (d) sand traps did provide modest improvement in runoff quality, but this improvement was insufficient to meet Tahoe basin discharge limits, and hence additional treatment was found to be needed to bring the effluent water quality into compliance.]]></description>
      <pubDate>Tue, 28 Dec 2004 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/746616</guid>
    </item>
    <item>
      <title>FROM RESORT AREA TO URBAN RECREATION CENTER: THEMES IN THE DEVELOPMENT OF LAKE TAHOE, 1946-1956.</title>
      <link>https://trid.trb.org/View/629771</link>
      <description><![CDATA[No abstract provided.]]></description>
      <pubDate>Thu, 17 Oct 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/629771</guid>
    </item>
    <item>
      <title>COMPILATION OF WORKING PAPERS: LAKE TAHOE WATERBORNE TRANSIT ANALYSIS.</title>
      <link>https://trid.trb.org/View/522880</link>
      <description><![CDATA[No abstract provided.]]></description>
      <pubDate>Fri, 21 Jun 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/522880</guid>
    </item>
    <item>
      <title>LAKE TAHOE BASIN WATER QUALITY PLAN: FINAL PLAN.</title>
      <link>https://trid.trb.org/View/521762</link>
      <description><![CDATA[No abstract provided.]]></description>
      <pubDate>Fri, 22 Sep 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/521762</guid>
    </item>
    <item>
      <title>ENVIRONMENTAL PROBLEMS OF THE LAKE TAHOE BASIN. HEARING, NINETY-SECOND CONGRESS, SECOND SESSION. AUGUST 21, 1972-BROCKWAY, CALIFORNIA..</title>
      <link>https://trid.trb.org/View/521781</link>
      <description><![CDATA[No abstract provided.]]></description>
      <pubDate>Fri, 22 Sep 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/521781</guid>
    </item>
    <item>
      <title>RESEARCH PAYS OFF: NEVADA'S WINTER STRATEGY KEEPS ROADS AND ENVIRONMENT CLEAN</title>
      <link>https://trid.trb.org/View/426567</link>
      <description><![CDATA[Nevada's Lake Tahoe Basin poses environmental concerns that demand special attention when abrasives and chemicals are used during snow and ice control operations.  The Nevada Department of Transportation (NDOT) needed to develop a winter maintenance strategy that balanced the safety requirements of the traveling public against the environmental needs of the Lake Tahoe Basin. NDOT accomplished this by combining its Road Weather Information System (RWIS) and its anti-icing research.  RWIS indicates when a storm will produce pavement icing conditions and thus when to apply anti-icing chemical.  The new strategy has enabled NDOT to reduce (a) the amount of chemicals used, ensuring minimal waste and effect on the environment; (b) the amount of abrasives used, improving air quality by decreasing particulate matter; and (c) manpower and equipment needs.  In addition, intangible benefits accrue to motorists because of the reduction in accidents and delays, a reduction caused by improved communications with the public on road conditions.]]></description>
      <pubDate>Tue, 11 Jul 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/426567</guid>
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