Intelligent Transportation Systems

The ISTEA/ITS Connection In California: The State Of The Relationship And Opportunities For Productive And Beneficial Linkages

Miller, Mark
Jia, Wenyu
1998

This report describes research which had three objectives: 1) investigate the current state of California's implementation of the Intermodal Surface Transportation Efficiency Act (ISTEA) with respect to Intelligent Transportation Systems (ITS), 2) assess the extent to which ITS has been integrated within the State's transportation planning process, and 3) recommend opportunities for linkages between ISTEA and ITS that have not yet been recognized. A literature search was first conduced which studied the key features of ISTEA, specific ITS-related issues, the institutional environment, and...

Identifying Walking Trips from GPS and Accelerometer Data in Adolescent Females

Rodriguez, D
Cho, GH
Elder, JP
Conway, TL
Evenson, KR
2012

Studies that have combined accelerometers and global positioning systems (GPS) to identify walking have done so in carefully controlled conditions. This study tested algorithms for identifying walking trips from accelerometer and GPS data in free-living conditions. The study also assessed the accuracy of the locations where walking occurred compared with what participants reported in a diary. A convenience sample of high school females was recruited (N = 42) in 2007. Participants wore a GPS unit and an accelerometer, and recorded their out-of-school travel for 6 days. Split-sample...

Models of Vehicular Collision: Development and Simulation with Emphasis on Safety V: MEDUSA: Theory, Examples, User's Manual, Programmer's Guide and Code

O'Reilly, Oliver M.
Papadopoulos, Panayiotis
Lo, Gwo-Jeng
Varadi, Peter C.
1999

This document constitutes a final report for MOU 39. It contains a User's Manual, Programmer's Guide, source code and underlying theory for the program MEDUSA. This program is capable of simulating both the normative driving dynamics and collision dynamics of an arbitrary number of vehicles. Its range of validity lies in the assumed nature of the vehicular collision, and it is recommended for use in studying low relative velocity impact scenarios at large time-scales. Keywords: IVHS America, Vehicle Dynamics, Collision Dynamics, Safety, computer Simluation, Animal and Simulation; A...

Digital Implementation of Adaptive Control Algorithms for MEMS Gyroscopes

Park, Sungsu
Horowitz, Roberto
Tan, Chin-Woo
2002

In this report, we present a hybrid discrete/ continuous time version of the observer-based adaptive control system for MEMS gyroscopes developed in [8], which can be readily implemented using digital processors. The control algorithm considered in this report is not fully a discrete time controller, since only the feedback control, parameter adaptation algorithms and feedforward control law are implemented in discrete time, while the velocity observer is still implemented in continuous time. A stochastic analysis of this algorithm is developed and it shows that the estimates of the...

Transit Integrated Collision Warning System Volume I: System Development

Chang, Joanne
Dicky, Susan
Duncil, Bart
Johnston, Scott
Kretz, Paul
Lian, Thang
Lu, Xiaoyun
Marco, David
Nelson, David
Shladover, Steven
Zhang, Wei-Bin
Zhang, Yongquan
Duggins, Dave
Gowdy, Jay
Hebert, Martial
Kozar, John
MacLachlan, Rob
Metz, Christoph
Steinfeld, Aaron
Suppe, Arne J
Burton, Frank
DeBone, Dan
Snyder, Rick
2007

Based on the foundation of the frontal and side collision warning systems, the Frontal Collision Warning System (FCWS) and Side Collision Warning System (SCWS) teams joined efforts to improve the collision warning algorithms. The objective of the ICWS Program is to study how frontal and side collision warning system might interface with each other, and to develop prototype ICWS systems on two buses, one at Samtrans and the other at PAT. The prototype ICWS buses have been in revenue operation in the Bay Area and Pittsburgh to collect field operational data and driver responses. The results...

Comparative Review of Portable Global Positioning System Units

Rodriguez, DA
Shay, E
Winn, P
2013

As research using portable Global Positioning System (GPS) technology to collect spatially explicit data on travel and physical activity proliferates, investigators have numerous available options for makes and models, but limited information on functionality and ease of use. This study compares portable GPS technology from four manufacturers, with a review of the size, cost, and basic specifications of the units, and their relative performance in signal acquisitions time, battery life, and accuracy.

WTRP-Wireless Token Ring Protocol

Ergen, Mustafa
2002

WTRP (Wireless Token Ring Protocol) is a medium access control (MAC) protocol for wireless networks. The MAC protocol through which mobile stations can share a common broadcast channel is essential in wireless networks. In a IEEE 802.11 network, the contention among stations is not homogeneous due to the existence of hidden terminals, partially connected network topology, and random access. Consequently, quality of service (QoS) is not provided. WTRP supports guaranteed QoS in terms of bounded latency and reserved bandwidth which are crucial real time constraints of the applications. WTRP...

Light Rail System Safety Improvements Using ITS Technologies

Chira-chavala, Ted
Coifman, Ben
Empey, Dan
Hansen, Mark
Lechner, Ed
Porter, Chris
1997

This report describes research which studied identifying and analyzing the effectiveness of countermeasures designed to reduce light rail crashes. Focus is in collisions with road vehicles at intersections. The light rail system for the Santa Clara County Transportation Agency in California served as the focus of the study.

Literature Review Report on Benefit/Cost Studies and Evaluations of Transit Management Systems

Jia, Xudong
Sullivan, Edward
Nuworsoo, Cornelius
Hockaday, Neil
2008

This study addresses the benefits and costs of Advanced Public Transportation Systems (APTS) applications in small and medium sized transit agencies using the research test implementation of a small transit oriented Intelligent Transportation System (ITS) on San Luis Obispo Transit as a case study. The Smart Transit System at San Luis Obispo is in a pre-commercialized state and implements the Efficient Development of Advanced Public Transportation Systems (EDAPTS) framework concept (Gerfen, 2001). The system has many potential benefits that will be identified and evaluated from a cost of...

San Francisco Bay Area US-101 Existing Conditions, ITS Assets, and Active Transportation and Demand Management Assessment

McKeever, Benjamin
Skabardonis, Alexander
Mauch, Michael
Campbell, Robert
Alexiadis, Vassili
Wornum, Christopher
2018

The 58.5-mile long Highway 101 corridor from the Bay Bridge to the SR 85/US-101 interchange in South San Jose accommodates just over 2.6 million trips on an average weekday. Travel delays on the US-101 corridor over the 2012-2016 five-year period increased by more than 91% (an average delay increase of over 18% per year). Given that California’s economy recently grew to become the sixth largest in the world, this waste of time stuck in traffic ranks among the most consequential economic inefficiencies in the world; workers in this region produce about 15 percent of California’s annual...