WorldCat Identities

Transportation Northwest (Organization)

Overview
Works: 228 works in 431 publications in 1 language and 1,332 library holdings
Classifications: HE336.T7, 388.314
Publication Timeline
Key
Publications about Transportation Northwest (Organization) Publications about Transportation Northwest (Organization)
Publications by Transportation Northwest (Organization) Publications by Transportation Northwest (Organization)
Most widely held works about Transportation Northwest (Organization)
 
Most widely held works by Transportation Northwest (Organization)
Comprehensive evaluation of transit signal priority system impacts using field observed traffic data ( Book )
6 editions published between 2007 and 2008 in English and held by 32 WorldCat member libraries worldwide
To improve the level of service for Community Transit (CT) buses, the South Snohomish Regional Transit Signal Priority (SS-RTSP) project has been launched. To understand the overall benefit of this project, the SS-RTSP system was tested and evaluated after the completion of the hardware and software installations on the 164th Street SW street corridor (phase-one) and the SR-99 corridor (phase-two) in Snohomish County, Washington State. In this study, impacts of the SS-RTSP system on both transit and local traffic operations were quantitatively evaluated based on field observed data. Simulation models were also built and calibrated to compute measures of effectiveness that cannot be obtained from field-observed data. With simulation models and field observed data, the impacts of the SS-RTSP system on both transit and local traffic operations were quantitatively evaluated
Quantifying incident-induced travel delays on freeways using traffic sensor data by Yinhai Wang ( Book )
6 editions published in 2008 in English and held by 30 WorldCat member libraries worldwide
Traffic congestion is a major operational problem for freeways in Washington State. Recent studies have estimated that more than 50% of freeway congestion is caused by traffic incidents. To help the Washington State Department of Transportation (WSDOT) identify effective countermeasures against such congestion-inducing incidents, a thorough understanding of travel delays caused by incidents is essential. This research project developed a new algorithm for quantifying travel delays induced by different incident categories using traffic data extracted from archived loop detector data and incident log data recorded by the WSDOT Incident Response (IR) team. The algorithm applies a modified deterministic queuing theory to estimate incident-induced delay using one-minute aggregated loop detector data. Incident-induced delay refers to the difference between the total delay and the recurring travel delay at the time and location associated with the impact of incident. The specialty of the delay calculation in this study is the use of a dynamic traffic-volumebased background profile, which is considered a more accurate representative of prevailing traffic conditions. According to the test results, the proposed algorithm can provide good incident-induced delay estimates and capture the evolution of freeway traffic flow during incident duration. Since the actual traffic data measured by loop detectors are used in this study to compute vehicle arrival and departure rates for delay calculations, the estimated incident-induced delay should be much closer to the reality than simulation based estimates
Managing pedestrian safety I : injury severity by Anne Vernez Moudon ( Book )
3 editions published in 2007 in English and held by 26 WorldCat member libraries worldwide
The study focuses on state routes in King County, Washington. Data came from police records processed by the Washington State Dept. of Transportation (WSDOT) from 1999 to 2004
AVL-equipped vehicles as speed probes : (final phase) by Daniel J Dailey ( Book )
3 editions published in 2005 in English and held by 25 WorldCat member libraries worldwide
Improving dual-loop truck (and speed) data : quick detection of malfunctioning loops and calculation of required adjustments by N. L Nihan ( Book )
3 editions published in 2006 in English and held by 23 WorldCat member libraries worldwide
Video image processing to create a speed sensor by Daniel J Dailey ( Book )
5 editions published between 1999 and 2000 in English and held by 22 WorldCat member libraries worldwide
AVL-equipped vehicles as traffic probe sensors by Daniel J Dailey ( Book )
3 editions published in 2002 in English and held by 19 WorldCat member libraries worldwide
Improving truck and speed data using paired video and single-loop sensors ( Book )
4 editions published in 2006 in English and held by 19 WorldCat member libraries worldwide
AVL-equipped vehicles as speed probes : (Phase 2) by Daniel J Dailey ( Book )
2 editions published in 2003 in English and held by 18 WorldCat member libraries worldwide
Pedestrian safety and transit corridors by Anne Vernez Moudon ( Book )
1 edition published in 2003 in English and held by 16 WorldCat member libraries worldwide
A precast concrete bridge bent designed to re-center after an earthquake by Laila Sif Cohagen ( )
4 editions published between 2008 and 2009 in English and held by 16 WorldCat member libraries worldwide
In this study the post-earthquake residual displacements of reinforced concrete bridge bents were investigated. The system had mild steel that was intended to dissipate energy and an unbonded, post-tensioned tendon that was supposed to remain elastic and re-center the column. The columns tested had different mild steel to prestress ratios, which affected their re-centering ability. A re-centering ratio developed by Hieber (2005), which took into account the external axial load, initial prestress force, and the mild steel ratio, was used to predict these re-centering capabilities. Two 40 percent scale specimens with large-bar connection details and a central unbonded, post-tensioned tendon were tested by using pseudo-static loading. The large-bar system is a rapidly constructible precast system for use in seismic regions. The test columns had re-centering ratios of 1.6 and 1.2. A column with the same connection details but no prestress and a re-centering ratio of 0.9 was used as a reference. The displacement at zero force in the test was used as a proxy for the residual displacement after an earthquake. The tests showed that columns with a larger re-centering ratio did experience lower residual drifts, although this distinction only became clear for drift ratios that exceeded 2 percent. The tests also showed that increases in post-tensioning force led to slight increases in damage at high drift ratios
Evaluation of dual-loop data accuracy using video ground truth data by N. L Nihan ( Book )
3 editions published in 2002 in English and held by 15 WorldCat member libraries worldwide
De-bonding of hot mix asphalt pavements in Washington State an initial investigation by Stephen T Muench ( )
4 editions published in 2008 in English and held by 15 WorldCat member libraries worldwide
Recent evidence in Washington State indicates that de-bonding of HMA surface layers may become a significant problem. "De-bonding" describes a condition where adjacent layers of HMA lose adhesion to one another and can become separated. Typically, design and construction practice is to build in a certain amount of bonding, however the appropriate amount, testing and techniques are still under debate. For WSDOT pavements, which are generally thick and long-lasting, this de-bonding is thought to be more prevalent between the surface layer (usually applied as a preservation overlay) and underlying layers. This de-bonding may contribute to early failure of the HMA pavement surface layer, which can increase pavement preservation costs. This study gathers initial evidence on debonding in Washington State and attempts to define the problem scope and potential performance impacts. Specifically it attempts (1) determine if de-bonding occurs, (2) identify possible de-bonding mechanisms, (3) define the scope of de-bonding in WSDOT pavements, (4) determine de-bonding impacts on pavement performance, and (5) identify the role of tack coats in de-bonding
Quantifying incident-induced travel delays on freeways using traffic sensor data phase II by Yinhai Wang ( )
4 editions published between 2008 and 2011 in English and held by 15 WorldCat member libraries worldwide
Traffic incidents cause approximately 50 percent of freeway congestion in metropolitan areas, resulting in extra travel time and fuel cost. Quantifying incident-induced delay (IID) will help people better understand the real costs of incidents, maximize the benefit-to-cost-ratio of investments in incident remedy actions, and facilitate the development of active traffic management and integrated corridor management strategies. Currently, a number of algorithms are available for IID quantification. However, these algorithms were developed with certain theoretical assumptions that are difficult to meet in real-world applications. Furthermore, they have only been applied to simulated cases and have not been sufficiently verified with ground-truth data. To quantify IID over a regional freeway network using existing traffic sensor measurements, a new approach for IID estimation was developed in this study. This new approach combines a modified deterministic queuing diagram with short-term traffic flow forecasting techniques to overcome the limitation of the zero vehicle-length assumption in the traditional deterministic queuing theory. A remarkable advantage with this new approach over most other methods is that it uses only volume data from traffic detectors to compute IID and hence is easy to apply. Verification with the video-extracted ground truth IID data found that the IID estimation errors with the new approach were within 6 percent for the two incident cases studied. This implies that the new approach is capable of producing fairly accurate freeway IID estimates using volumes measured by existing traffic sensors. This approach has been implemented on a regional map-based platform to enable quick, convenient, and reliable freeway IID estimates in the Puget Sound region
Vehicle occupancy forecasting by Cyrus G Ulberg ( Book )
3 editions published between 1993 and 1994 in English and held by 14 WorldCat member libraries worldwide
Forecasting freeway and ramp data for improved real-time control and data analysis by N. L Nihan ( Book )
1 edition published in 1993 in English and held by 13 WorldCat member libraries worldwide
On-line implementation of a fuzzy neural ramp metering algorithm by Cynthia E Taylor ( Book )
3 editions published in 1997 in English and held by 13 WorldCat member libraries worldwide
Developing a GPS-based truck freight performance measure platform by Edward Donald McCormack ( )
4 editions published in 2010 in English and held by 12 WorldCat member libraries worldwide
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Documentation of TSMC software that interfaces with traffic analysis problems by Cynthia E Taylor ( Book )
2 editions published in 1997 in English and held by 12 WorldCat member libraries worldwide
Options for making concurrency more multimodal phase II revised ( Book )
5 editions published in 2007 in English and held by 11 WorldCat member libraries worldwide
 
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Alternative Names
TransNow (Organization)
Transportation Northwest Regional Center
Transportation Northwest (TransNow) Regional Center
University of Washington. Department of Civil Engineering. Transportation Northwest
Languages
English (73)