WorldCat Identities

Transportation Northwest (Organization)

Overview
Works: 231 works in 433 publications in 1 language and 1,375 library holdings
Genres: Directories 
Classifications: HE336.T7, 388.314
Publication Timeline
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Most widely held works about Transportation Northwest (Organization)
 
Most widely held works by Transportation Northwest (Organization)
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 26 WorldCat member libraries worldwide

Traffic congestion is a major operational problem for freeways in Washington State. Recent studies have estimated that more than 50 percent 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. By using traffic data extracted from archived loop detector measurements and incident log data recorded by the WSDOT Incident Response (IR) team, this research project developed a new algorithm for quantifying travel delays produced by different incident categories. The algorithm applies a modified deterministic queuing theory to estimate incident-induced delay by using 1-minute aggregated loop detector data. Incident-induced delay refers to the difference between the total delay and the recurrent travel delay at the time and location influenced by the incident. The uniqueness of the delay calculation in this study is the use of a dynamic traffic-volume-based background profile, which is considered a more accurate representation of prevailing traffic conditions. According to the test results, the proposed algorithm can provide good estimates for incident-induced delay and capture the evolution of freeway traffic flow during incident duration. Because actual traffic data measured by loop detectors were used in this study to compute vehicle arrival and departure rates for delay calculations, the estimated incident-induced delay should be very close to the reality. Additionally, the proposed algorithm was implemented in the Advanced Roadway Incident Analyzer (ARIA) system. ARIA is a database-driven computer system that automates all the computational processes. More accurate incident delay information will help WSDOT improve its understanding of congestion-inducing incidents and select more effective countermeasures against incident-related traffic congestion on freeways
AVL-equipped vehicles as speed probes : (final phase) by Daniel J Dailey( Book )

3 editions published in 2005 in English and held by 24 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 )

4 editions published in 2006 in English and held by 22 WorldCat member libraries worldwide

Summary of WA-RD report
Managing pedestrian safety I : injury severity by Anne Vernez Moudon( Book )

2 editions published in 2007 in English and held by 21 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 : (Phase 2) by Daniel J Dailey( Book )

2 editions published in 2003 in English and held by 17 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 17 WorldCat member libraries worldwide

Comprehensive evaluation of transit signal priority system impacts using field observed traffic data( Book )

3 editions published in 2008 in English and held by 16 WorldCat member libraries worldwide

Vehicle occupancy forecasting by Cyrus G Ulberg( Book )

5 editions published between 1993 and 1994 in English and held by 15 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 15 WorldCat member libraries worldwide

Pedestrian safety and transit corridors by Anne Vernez Moudon( Book )

1 edition published in 2003 in English and held by 15 WorldCat member libraries worldwide

This research examines the relationship between pedestrian accident locations on state-owned facilities (highways and urban arterials) and the presence of riders loading and alighting from bus transit. The research also examines the association between pedestrian collisions and other travel generators (concentrations of retail activity and housing) as well as environmental conditions (wide roadways, high traffic volumes, and high speed limits)
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 14 WorldCat member libraries worldwide

Forecasting freeway and ramp data for improved real-time control and data analysis by N. L Nihan( Book )

2 editions published in 1993 in English and held by 13 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 12 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 12 WorldCat member libraries worldwide

The use of uncalibrated roadside CCTV cameras to estimate mean traffic speed by Daniel J Dailey( Book )

2 editions published in 2001 in English and held by 11 WorldCat member libraries worldwide

Use of automatic vehicle identification techniques for measuring traffic performance and performing incident detection by Mark E Hallenbeck( Book )

4 editions published in 1992 in English and held by 11 WorldCat member libraries worldwide

De-bonding of hot mix asphalt pavements in Washington State : an initial investigation by Stephen T Muench( Book )

3 editions published in 2008 in English and held by 6 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
A precast concrete bridge bent designed to re-center after an earthquake by Laila Sif Cohagen( Book )

4 editions published between 2008 and 2009 in English and held by 5 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
Options for making concurrency more multimodal : phase II revised( Book )

7 editions published in 2007 in English and held by 5 WorldCat member libraries worldwide

Quantifying incident-induced travel delays on freeways using traffic sensor data. final research report by Yinhai Wang( Book )

4 editions published between 2010 and 2011 in English and held by 1 WorldCat member library worldwide

To quantify incident-induced delay (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
 
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Audience level: 0.73 (from 0.56 for Quantifyin ... to 1.00 for Transporta ...)

Associated Subjects
Alternative Names
TransNow (Organization)

Transportation Northwest Regional Center

Transportation Northwest (TransNow) Regional Center

University of Washington. Department of Civil Engineering. Transportation Northwest

Languages
English (75)