Intelligent Transportation Systems

Vehicle Reidentification and Travel Time Measurement. I. Congested Freeways

Coifman, B.
Cassidy, M.
2001

The paper presents an algorithm for matching individual vehicles measured at a freeway detector with the vehicles' corresponding measurements taken earlier at another detector located upstream. Although this algorithm is potentially compatible with many vehicle detector technologies, the paper illustrates the method using existing dual-loop-detectors to measure vehicle lengths. This detector technology has seen widespread deployment for velocity measurement. Since the detectors were not developed to measure vehicle length, these measurements can include significant errors. To overcome this...

Cal Poly Pomona EDAPTS Test Deployment Operations Description Version 6.0

Jia, Xudong, PhD
Gerfen, Jeff
2007

This report documents the outcomes of the February 6, 2007 workshop. It presents the most valued system characteristics of the Bronco Express EDAPTS system through the use of scored operational scenarios. The operational scenarios included in this report are down selected from those described in the initial release (V3.0) of the Operations Description report. The Advisory Panel members considered only scenarios with medium or high priority to be worthy of final consideration as deployable elements. These selected scenarios will allow the researchers to have an overall understanding of how...

Investigating Intelligent Transportation Systems Strategies On The Santa Monica Freeway Corridor: Technical Appendix

Bacon, Jr., V.
Windover, John
May, Adolf D.
1995

This document contains the technical appendices to the report on Investigating Intelligent Transportation Systems Strategies on the Santa Monica Freeway Corridor (see PATH Database record no. 8800.)

Assessing the Benefits and Costs of ITS Projects: Volume 1 Methodology

Gillen, David
Li, Jianling
Dahlgren, Joy
Chang, Elva
1999

In this document a framework for evaluating ITS projects is developed. One of the central issues addressed is whether ITS projects are distinctly different from other more conventional transportation projects and thus the traditional decision methods such as Benefit-cost analysis cannot be used. The answer is mixed. The decision models used in the past are still relevant, however, these have been applied in an environment in which there was a well developed data base. The models identified, selected, assembled and evaluated data to make judgements as to whether the proposed projects were...

Planits: A Functional Description

Khattak, Asad
Kanafani, Adib
1995

This paper presents a functional description of PLANiTS (Planning and Analysis Integration for Intelligent Transportation Systems). The methodology consists of a process-based computer system that supports a series of mutually interdependent steps which progress toward developing and programming transportation improvement projects. PLANiTS can translate problems and goals to performance measures, examine possible competing and complementary actions that can address the problems, systematically evaluate the impacts of actions by using appropriate knowledge-based and model-based tools, and...

Vehicle Reidentification and Travel Time Measurement on Congested Freeways

Coifman, Benjamin
Cassidy, Michael
2002

The paper presents an algorithm for matching individual vehicles measured at a freeway detector with the vehicles’ corresponding measurements taken earlier at another detector located upstream. Although this algorithm is potentially compatible with many vehicle detector technologies, the paper illustrates the method using existing dual-loop detectors to measure vehicle lengths. This detector technology has seen widespread deployment for velocity measurement. Since the detectors were not developed to measure vehicle length, these measurements can include significant errors. To overcome this...

An Integrated Physical/link-access Layer Model Of Packet Radio Architectures

Polydoros, Andreas
1994

The goal of this effort is to devise and analyze an integrated Physical/ Link-Access Layer Model of packet Radio Architectures, with application to the PATH/IVHS (Intelligent Vehicle Highway Systems) communication sub- system design between vehicles and infrastructure, as well as between vehicles on the move. The present report contributes to a generic conceptual model for system evaluation which can be used for quantification of the interaction between network layers. The research tasks that have been performed for achieving the project objectives include collection of data requirements...

Region-Wide Congestion Prediction and Control Using Deep Learning

Mohanty, Sudatta
Pozdnukhov, Alexey
Cassidy, Michael
2020

Traffic congestion is forecast for neighborhoods within a region using a deep learning model. The model is based on Long Short-Term Memory (LSTM) neural network architecture. It forecasts a congestion score, defined as the ratio of the vehicle accumulation inside a neighborhood to its trip completion rate. Inputs include congestion scores measured at earlier times in neighborhoods within a region, and three other real-time measures of regional traffic. The ideas are tested using Newell’s simplified theory of kinematic waves. Simplified street networks are featured first. Initial tests...

ITS in developing countries: strategic opportunities

Richardson, BC
Rodriguez, DA
1997

Development of intelligent transportation systems has taken on worldwide dimensions. For underdeveloped nations the desire to embrace ITS creates a formidable challenge. As noted by the authors, however, there is a window of opportunity for avoiding the costly mistakes while reproducing the successes experienced by industrialized countries. This article identifies potential obstacles, defines various strategies and suggests ITS can be used as an integrator to achieve true strategic regional plans so often neglected in developing areas.

A Comparison of GPS and Travel Diaries to Characterize Walking Behavior

Cho, G
Rodriguez, DA
Clifton, KJ
Evenson, K
2008

While travel diaries are widely used to investigate walking behavior, the emergence of portable GPS units provides an innovative approach to characterizing walking behavior. This study compares the number and duration of daily walking trips reported in travel diaries with data extracted from a portable GPS unit and identified as the same walking trips. The study had two phases: (1) We used 35 person-days of travel data to determine the best algorithm for identifying walking trips from GPS data. The best algorithm had high Pearson (0.89) and Spearman correlation (0.85).