ITS Library

The Lagged Cell-Transmission Model

Daganzo, Carlos F.
1999

In cell-transmission models of highway traffic one partitions a highway into small sections (cells) and keeps track of the cell contents (number of vehicles) as time passes. The record is updated at closely spaced instants (clock ticks) by calculating the number of vehicles that cross the boundary separating each pair of adjoining cells during the corresponding clock interval. This paper shows that the accuracy of the cell-transmission approach is enhanced if the downstream density that is used to calculate the receiving flow(s) is read L clock intervals earlier than the current time...

Preface

Bayen, Alexandre M.
2009

1. Introduction: Management of canal networks at the age of informationtechnology. With the miniaturization of sensors and their decreasing costs,the paradigm of instrumentation of the built infrastructure and the environment hasnow been underway for several years, leading to numerous successful and sometimesspectacular realizations such as the instrumentation of the Golden Gate with wire-less sensors a few years ago. The convergence of communication, control and sensingon numerous platforms including multi-media platforms has enabled engineers toaugment physical infrastructure systems...

Reliability and One-Year Stability of the PIN3 Neighborhood Environmental Audit in Urban and Rural Neighborhoods

Porter, AK
Wen, F
Herring, AH
Rodriguez, D
Messer, LC
Laraia, BA
Evenson, K
2018

Reliable and stable environmental audit instruments are needed to successfully identify the physical and social attributes that may influence physical activity. This study described the reliability and stability of the PIN3 environmental audit instrument in both urban and rural neighborhoods. Four randomly sampled road segments in and around a one-quarter mile buffer of participants’ residences from the Pregnancy, Infection, and Nutrition (PIN3) study were rated twice, approximately 2 weeks apart. One year later, 253 of the year 1 sampled roads were re-audited. The instrument...

Wavepacket Models for Subsonic Twin Jets Using 3D Parabolized Stability Equations

Rodriguez, DA
Jotkar, MR
Gennaro, EM
2018

An extension of the classical parabolized stability equations to flows strongly dependent on the two cross-stream spatial directions and weakly dependent on the streamwise one is applied to model the large-scale structures present in twin-jet configurations. The existence of these ...

California’s Freeway Service Patrol Program Management: Information System Annual Report Fiscal Year 2006-07

Mauch, Michael
Skabardonis, Alex
2008

The Freeway Service Patrol (FSP) is an incident management program implemented by Caltrans, the California Highway Patrol and local partner agencies to quickly detect and assist disabled vehicles and reduce non-recurring congestion along the freeway during peak commute hours. The first FSP program was piloted in Los Angeles, and was later expanded to other regions by state legislation in 1991. As of June 2007, there were thirteen participating FSP Programs operating in California, deploying over 350 tow trucks and covering over 1,650 (center-line) miles of congested California freeways.The...

A Systematic Evaluation Of The Impacts Of Real-traffic Condition Information On Traffic Flow

Adler, Jeffrey L.
Recker, Wilfred W.
Mcnally, Michael G.
1993

The focus of this research effort is the study of driver behavior in the presence of real-time traffic condition information. The methodology adapted for this research involves three parts: development of a theoretical model for driver behavior under Advanced Traveler Information Systems (ATIS), interactive simulation experiments, data analysis and behavioral modeling. FASTCARS, an interactive computer-based simulator that has been developed for in-laboratory experimentation to gather data for estimating and calibrating predictive models of driver behavior under conditions of real-time...