Roads/Highways

Freeway Service Patrol Evaluation

Skabardonis, Alexander
University of California, Berkeley
California Department of Transportation
1995

This report presents the findings of a comprehensive evaluation of the freeway service patrol (FSP) program on specific freeway section in the San Francisco Bay Area. The study methodology consisted of determining the savings in incident delay and other performance measures "before" and " after" the implementation of FSP based on field data and improved analysis procedures. Data were collected during the peak periods on a mile section of the I-880 freeway in the City of Hayward, Alameda County. Software was developed to process the field data and create a computerized database. Benefits of...

Freeway Performance Measurement System: Operational Analysis Tool

Choe, T
Skabardonis, A
Varaiya, P
Transportation Research Board
2002

The freeway performance measurement system (PeMS) is a system for all of California. It processes 2 gigabytes/day of 30-s loop detector data in real time to produce useful information. Managers at any time can have a uniform and comprehensive assessment of freeway performance. Traffic engineers can base their operational decisions on knowledge of the current state of the freeway network. Planners can determine whether congestion bottlenecks can be alleviated by improving operations or by minor capital improvements. Travelers can obtain the current shortest route and travel time estimates....

Freeway Performance Measurement System: Mining Loop Detector Data

Chen, Cong
Petty, K
Skabardonis, A
Varaiya, P
Jia, Z
Transportation Research Board
2001

Performance Measurement System (PeMS) is a freeway performance measurement system for all of California. It processes 2GB/day of 30-s loop detector data in real time to produce useful information. At any time managers can have a uniform, comprehensive assessment of freeway performance. Traffic engineers can base their operational decisions on knowledge of the current status of the freeway network. Planners can determine whether congestion bottlenecks can be alleviated by improving operations or by minor capital improvements. Travelers can obtain the current shortest route and travel time...

Framework for Analysis of Recurring Freeway Bottlenecks

Skabardonis, Alexander
Rouphail, Nagui M
Petty, Karl
Dowling, Richard G
Transportation Research Board
2008

Recent statistics indicate a dramatic increase in congestion delay due to recurrent freeway bottlenecks. Proper identification of freeway bottlenecks and their causes is the key to formulating plans for reducing congestion. Relatively low-cost geometric and operational improvements can often mitigate the effects of a bottleneck. The paper presents the findings to-date on an ongoing NCHRP project on low cost improvements for recurring freeway bottlenecks. The research surveyed the state of the art and practice both in the US and overseas, proposed a definition of bottlenecks, bottleneck...

Field Testing the Effectiveness of Adaptive Traffic Control for Arterial Signal Management

Campbell, Robert
Skabardonis, Alexander
University of California, Berkeley
2014

The report describes the methodology and findings of the evaluation of adaptive signal control in a real-life corridor. The study section was a five mile section of the Pacific Coast Highway in Los Angeles with nine signalized intersections operating under adaptive control using the Los Angeles DOT ATCS (adaptive traffic control system). Optimal fixed time time-of-day plans were developed and implemented at the test site. The performance of the ATCS system and the fixed-time plans was evaluated using extensive field data on travel times and queue lengths collected through probe vehicles,...

Extracting Vehicle Trojectories from Video Data: The NGSIM Ptototype Data Set

Sim, Z W
Skabardonis, A
University of California, Berkeley
2005

The Next Generation Simulation (NGISM) program, initiated by the Federal Highway Administration (FHWA), has as its objective the development of behavioral algorithms that support microscopic traffic simulation, accompanied by documentation and validation sets. This article relates how algorithms from the California Partners for Advanced Transit and Highways (PATH) program were selected to produce a prototype data set of vehicle trajectories as well as aid in assessing the viability of emerging technologies for automating the trajectory generation process. Vehicle trajectories are needed to...

Estimation of Measures of Effectiveness Based on Connected Vehicle Data

Argote, J
Christofa, E
Xuan, Yiguang
Skabardonis, A
Institute of Electrical and Electronics Engineers (IEEE)
2011

Vehicle-infrastructure cooperation via the Connected Vehicle initiative is a promising mobile data source for improving real-time traffic management applications such as adaptive signal control. This paper focuses on developing estimation methods with the use of Connected Vehicle data for several measures of effectiveness (e.g., queue length, average speed, number of stops), essential for determining traffic conditions on urban signalized arterials for real-time applications. This research systematically determines minimum penetration rates that allow accurate estimates for a wide range of...

Estimation of Arterial Measures of Effectiveness with Connected Vehicle Data

Argote, Juan
Christofa, Eleni
Xuan, Yiguang
Skabardonis, Alexander
Transportation Research Board
2012

The Connected Vehicle technology is a promising mobile data source for improving real-time traffic conditions monitoring and control. This paper presents estimation methods for a variety of measures of effectiveness both at the arterial and intersection level (e.g., average speed, acceleration noise, queue length). These performance measures are essential for determining traffic conditions and improving signal control strategies in real-time. The estimation methods are tested with two datasets comprising of various traffic conditions: undersaturated and oversaturated and the minimum...

Estimating the Impacts of Signal Hardware Improvements

Skabardonis, A
1996

Signal equipment upgrades (e.g., multiple timing plan capability and signal interconnection) are commonly used to improve the quality of traffic flow in urban arterials and networks. The findings of the assessment of the effects of alternative control scenarios to assist practicing engineers in conducting analyses to determine the effectiveness of proposed signal equipment upgrades are presented. The effectiveness of hardware improvements was evaluated against the optimal timings with the available equipment to differentiate the benefits from installing hardware from the benefits from...

Estimating Queue Length Under Connected Vehicle Technology: Using Probe Vehicle, Loop Detector, and Fused Data

Li, Jing-Quan
Zhou, Kun
Shladover, Steven E
Skabardonis, Alexander
2013

With the emergence of connected vehicle technology, the use of probe trajectory data to estimate queue length has recently received considerable attention. Unlike data collected by loop detectors, probe trajectory data can provide a lower bound on the queue length even if the market penetration rate is low. An event-based method is developed: it uses both probe trajectory and signal timing data to estimate queue length, and the estimation accuracy under different market penetration rates is examined. A data fusion method is developed: it combines probe trajectory data and loop detector...