PATH

Weaving Analysis, Evaluation and Refinement

Skabardonis, Alexander
Kim, Amy
2010

Weaving sections are common design elements on freeway facilities such as near ramps and freeway to-freeway connectors. When the traffic demands exceed the capacity at weaving areas congestion may occur, which affects the operation of the entire freeway section. Traffic operational problems also may exist at weaving areas even when traffic demands are less than capacity because of the complexity of vehicle interactions, resulting in poor level of service (LOS) and potential safety problems. Existing procedures for the design and analysis of freeway weaving sections have several...

Traffic Modeling To Evaluate Potential Benefits Of Advanced Traffic Management And In-vehicle Information Systems In A Freeway/Arterial Corridor

Gardes, Yonnel
1990

This study includes a literature review of existing traffic simulation models potentially suited for evaluating advanced traffic control strategies and in-vehicle information systems within an integrated freeway/ arterial corridor. Chapter 1 presents a literature review and identification of candidate models. Chapter 2 contains a preliminary screening of candidate models. Chapter 3 presents an in-depth evaluation of short list of models. And, Chapter 4 gives conclusions of the research and recommendations for future directions.

Development of an Adaptive Corridor Traffic Control Model

Recker, Will
Zhenhg, Xing
Chu, Lianyu
2010

This research develops and tests, via microscopic simulation, a real-time adaptive control system for corridor management in the form of three real-time adaptive control strategies: intersection control, ramp control and an integrated control that combines both intersection and ramp control. The development of these strategies is based on a mathematical representation that describes the behavior of traffic flow in corridor networks and actuated controller operation. Only those parameters commonly found in modern actuated controllers (e.g., Type 170 and 2070 controllers) are considered in...

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...

Onboard Monitoring and Reporting for Commercial Vehicle Safety (OBMS) Phase II: Field Operational Test

Misener, Jim
Nowakowski, Christopher
O'Connell, Jessica
Murray, John
2008

Each year in the United States over 450,000 large trucks are involved in crashes, resulting in about 5000 fatalities and 120,000 injuries. Significantly, truck driver error is a major causal factor to truck-involved crashes. This points toward onboard monitoring as a promising means to encourage good driving behavior, it would recognizing and provide necessary feedback to correct self-induced hazardous driving situations. This is the basis for our past prototype development effort, which has produced under Task Orders 5509 and 6609 a suite of hardware on a Freightliner Century Class.This...

Assessing the Role of AVL in Demand Responsive Transportation Systems

Gillen, David
Raffaillac, Julie
2002

Many-to-many demand responsive transportation systems consist of vehicles which take passengers from their origins to their destinations within a service area. In dial-a-vehicle systems, in order to circumvent the undesirable feature of taxicab systems, vehicles are allowed to deviate from their direct route to serve other passengers and the emphasis is on building efficient tours to increase vehicle productivity. This strategy increases riding times but also increases average occupancy and productivity of the vehicles, and hence decreases average waiting times. A similar problem is faced...

Lateral Control of Heavy Vehicles for Automated Systems

Hingwe, Pushkar
Wang, Jen-Yu
Tai, Meihua
Tomizuka, Masayoshi
2003

This is the final report for MOU 313, "Lateral Control of Heavy Vehicles for Automated Highway Systems". It address the following task items: Analysis and synthesis of control algorithms based on system identification and calibration results (Task 4. in the MPU), Closed loop results at highway speeds (Task 5), limits and persormance of sensors, actuators and control schemes as infered from data collected during closed loop experiments at 55 MPH (task 6) and baseline safety requirements based on closed loop data (task 7) Five controllers were designed based on the model identification study...

Qualitative Analysis on the Performance of Non-uniform Platoons: Report I; Non-uniformities and Performance Issues

Tongue, Benson H.
Packard, Andy
Sachi, Paul
1997

This is the first of two reports in which we detail the accomplishments and findings of a two-year research project aimed at determining control and spacing strategies as well as developing performance issues for automated vehicles traveling in platoons under non-uniform conditions. The first phase of the research was geared toward determining parameter uncertainty ranges for a given model and expected disturbances that materially affect the behavior of a vehicle in a platoon. Once this was completed, the relevant criteria for determining platoon performance were investigated. A simulation...

Assessing the Value of TMCs and Methods to Evaluate the Long Term Effects of ITS Implementation: A General Equilibrium Approach

Gillen, David
2004

This research builds on the contributions of MOU 357, 3001 and task Order 4119 all of which focus on methodological and measurement issues in benefit cost assessments of ITS applications. The important contributions of this work are not only providing methods for calculating benefits and costs but also an empirical assessment of the set of projects that have been implemented. In all of this work, as well as most other project evaluation studies, two strong assumptions are made. First, the project is implemented successfully and second the impact of the transportation project is felt wholly...

Vehicle Assist and Automation Demonstration Report

California Department of Transportation (Caltrans)
Partners for Advanced Transportation Technology (PATH)
2017

Vehicle Assist and Automation (VAA) systems enable lane-keeping and precision docking of transit vehicles. They offer the opportunities of providing high-quality transit service within reduced lane widths. Sponsored by the United States Department of Transportation, this VAA project aimed to demonstrate the technical merits and feasibility of VAA applications in bus revenue service. The VAA Demonstration project was carried out through the four phases of design, development, deployment, and operational tests. In the design phase, the system architecture and requirements were finalized, and...