PATH

ITS Decision Enhancements: Developing Case-Based Reasoning and Expert Systems and Incorporating New Material

Dahlgren, Joy
Khattak, Asad
McDonough, Patrick
Banerjee, Ipsita
Orrick, Phyllis
Sharafsaleh, Ashkan
2004

The ITS Decision website has been developed for the user who is interested in learning about various Intelligent Transportation System (ITS) technologies. Two tools have been developed that will help those users who wish to address a specific problem, obtain information relating to their particular context. These are the Expert System and the Case Based Reasoning tools. The Expert System tool queries the user on the problem context and the problem in general. It then presents information on different types of ITS technologies that may be used to address the problem. The Case-Based...

A First Investigation of Truck Drivers’ On-the-Road Experience Using Cooperative Adaptive Cruise Control

Yang, Shiyan
Shladover, Steven E.
Lu, Xiao-Yun
Spring, John
Nelson, David
Ramezani, Hani
2018

Cooperative Adaptive Cruise Control (CACC) is a driver assist technology that uses vehicle-to-vehicle wireless communication to realize faster braking and acceleration responses in following vehicles and shorter headways compared to Adaptive Cruise Control (ACC). This technology not only enhances road safety, but also offers fuel saving benefits as a result of reduced aerodynamic drag. The amount of fuel savings is dictated by the following distances and the driving speeds. So, the overarching goal of this work is to explore truck drivers’ preferences and behaviors when following in “CACC...

Evaluation Of The I-110 Corridor Smart Card Demonstration Project

Giulian, Genevieve
Moore, II, James
1996

This report presents an evaluation of the Phase II Smart Card Demonstration Project, the goal of which is to develop a transit fare payment system for commercialization that will improve transit efficiency and effectiveness. The major focus of the project is the testing of selected technologies in revenue service. Two types of fare payment cards were selected: a contactless radio frequency (RF) card and a contact card. The advanced fare payment system includes passenger transaction units installed on buses and the associated control and communications system. The evaluation covers the...

Bus Rapid Transit (BRT) Toolbox: BRT Person Throughput-Vehicle Congestion Tradeoffs

Jingquan, Li
Chan, Ching-Yao
Zhou, Kun
Zhang, Wei-Bin
2015

This report documents a research effort to understand the current practice and issues associated with Bus Rapid Transit (BRT) planning and deployment. It reviewed the design options incorporated into existing BRT deployments across California and the nation. The project team interviewed practitioners of California Department of Transportation (Caltrans) Districts and transit agencies to understand the BRT project approval decision-making process, the impacts of BRT implementation and the Measures of Effectiveness (MOEs) for transit and non-transit system performance. The studies revealed...

Interim Report: Compliance and Commercial Vehicle Operators – A Systems Evaluation of the Problem and Virtual Solutions

Madanat, Samer
Rodier, Caroline
Allen, Denise
Johnston, Scott
Miller, Mark A.
Allen, Jaime
Benjamin-Chung, Jade
Kazanjy, Michael
Narayan, Atul
Giuliano, Gen
McFerrin, Peter
2008

This report documents a review of the literature for commercial motor vehicle inspection and compliance stations and its relationship with the growth of truck travel over the next 25 years and the lack of concurrent capacity increases in staffing at such stations. Problems result in that more commercial vehicles will need to stop for inspection with longer queues at weigh stations associated with increased congestion, increased wait times, more idling trucks, and increased safety hazards. Alternatively, without stopping at inspection and compliance stations other problems will result such...

Data Utilization At California Transportation Management Centers

Chan, Shirley
Chang, Elbert
Lin, Wei-hua
Skabardonis, Alexander
1998

This study looked at the operations and functions performed at the Caltrans Transportation Management Centers (TMC) with focus on the data sources, data processing, and performance measures. Recommendations are made for making greater use of archived real-time archived data. These include establishing a performance monitoring system, using the data to estimate performance measures, and providing procedures for data processing and dissemination.

Freeway Performance Measurement System (PeMS), Version 3 Phase II

Varaiya, Pravin
2004

This continuing PeMS project had four tasks: 1. Quantify the reduction in delay from optimum freeway operations; 2. Release travel time estimates to the public; 3. Training Caltrans staff in the use of PeMS; 4. Improve system robustness/maintenance. For task 1, we developed and implemented an algorithm that quantifes potential travel time reduction. The algorithm takes historical travel demand data from PeMS. It simulates the resulting traffic flow, based on an idealized ramp-metering algorithm, and calculates the resulting travel times on the freeway and waiting time at the ramps. As an...

Analyses of the Response of Pavements Containing Ceramic Plugs for Vehicle Guidance

Monismith, Carl L.
2004

In studies undertaken by staff of the PATH Program concerned with automatic vehicle control (AVC) ceramic sensors (magnets) have been placed at or near the surface of both asphalt concrete (AC) and portland cement concrete (PCC) pavements. Thus far sensors have been installed at three locations: 1) AC pavement at the Richmond Field Station (RFS); 2) AC and PCC pavement on Interstate 15 in San Diego, CA; and 3) AC and PCC pavement on Interstate 80 near Donner Summit, CA. The installations at Donner Summit have been used for the guidance of snow plows during the winter months. With increased...

Design And Evaluation Of An Automated Highway System With Optimized Lane Assignment

Hall, Randolph W.
Caliskan, Cenk
1997

This paper extends earlier research on optimal lane assignment on an automated highway to dynamic networks. A path-based linear program is formulated and solved through a column generation method.

SafeTrip 21 Initiative: Networked Traveler Foresighted Driving Field Experiment Final Report

Nowakowski, Christopher
Gupta, Somak Datta
Sengupta, Raja
Mannasseh, Christian
Spring, John
VanderWerf, Joel
Sharafsaleh, Ashkan
Vizzini, Daniel
2011

This report describes the SafeTrip-21, Networked Traveler Foresighted Driving Field Experiment conducted as part of the US DOT’s SafeTrip-21 initiative. This experiment developed and evaluated an Advanced Driver Assistance System providing soft-safety or situational awareness alerts regarding “Slow Traffic Ahead” when driving on a freeway. The Networked Traveler system detects slow traffic or queues at several thousand locations in the Bay area, monitors the locations and speeds of its test subjects as they drive, and determines if the driver is approaching the slow traffic fast enough to...