PATH

Evaluation of the Effects of Intelligent Cruise Control Vehicles in Mixed Traffic

Ioannou, Petros
2003

This is the final report for the project entitled "Evaluation of the Effects of Intelligent Cruise Control Vehicles in Mixed Traffic". The project was initially under MOU392 and switched to Task Order 4217 at the beginning of the 2nd year of the project. Due to this administrative change a final report was submitted to PATH for MOU392 covering all the tasks completed during the 1st year of the project. The two research tasks that were not completed under MOU392 became the main focus of Task Order 4217.

TRACER: In-Vehicle, GPS-Based, Wireless Technology for Traffic Surveillance and Management

McNally, M. G.
Marca, J. E.
Rindt, C. R.
Koos, A. M.
2003

The fundamental principle of intelligent transportation systems is to match the complexity of travel demands with advanced supply-side analysis, evaluation, management, and control strategies. A fundamental limitation is the lack of basic knowledge of travel demands at the network level. Modeling and sensor technology is primarily limited to aggregate parameters or micro-simulations based on aggregate distributions of behavior. Global Positioning Systems (GPS) are one of several available technologies which allow individual vehicle trajectories to be recorded and analyzed. Potential...

Dynamic All-Red Extension at Signalized Intersection: Probabilistic Modeling and Algorithm

Zhang, Liping
Zhou, Kun
Zhang, Wei-Bin
Misener, James A.
2011

Dynamic All-Red Extension (DARE) has recently attracted research interest as a non-traditional intersection collision avoidance method. We propose a probabilistic model to predict red light running (RLR) hazard for dynamic all-red extension system. The RLR hazard, quantified by a predicted encroachment time, has contributory factors including the speed, distance and car-following status of the violator and the empirical distribution of the entry time of conflict traffic. An offline data analysis procedure is developed to set the parameters for RLR hazard prediction. Online-wise, a two-...

Time Space Diagrams for Thirteen Shock Waves

Coifman, Benjamin
1997

This paper presents microscopic time-space diagrams for several shock waves over 100-200m distances. The primary focus of the paper is on presenting the data rather than analysis. The diagrams should be of general interest to researchers studying traffic congestion.

Throttle and Brake Control Systems for Automatic Vehicle Following

Ioannou, P.
Xu, Z.
1994

In this paper, the authors present several throttle and brake control systems for automatic vehicle following. These control systems are designed and tested using a validated nonlinear vehicle model first and then actual vehicles. Each vehicle to be controlled is assumed to be equipped with sensors that, in addition to its own vehicle characteristics, provide measurements of the relative distance and relative speed between itself and the vehicle in front. Vehicle-to- vehicle communication required for the stability of the dynamics of a platoon of vehicles with desired constant intervehicle...

Thermal-Enhanced Adaptive Interval Estimation in Battery Packs with Heterogeneous Cells

Zhang, Dong
Couto, Luis D.
Gill, Preet S.
Benjamin, Sebastien
Zeng, Wente
Moura, Scott J.
2022

The internal states of lithium-ion batteries need to be carefully monitored during operation to manage energy and safety. In this article, we propose a thermal-enhanced adaptive interval observer for state-of-charge (SOC) and temperature estimation for a battery pack. For a large battery pack with hundreds or thousands of heterogeneous cells, each individual cell characteristic is different from others. Practically, applying estimation algorithms on each and every cell would be mathematically and computationally intractable since battery packs are often characterized by combinations of...

A Low-Cost Wireless MeMS System for Measuring Dynamic Pavement Loads

Varaiya, Pravin
2008

Work done under this "Innovative Proposal" may be summarized as follows. A closed-form series solution is provided for the displacement of a pavement loaded by a truck modeled as an Euler beam with elastic foundation under a moving load. A method is developed to estimate the load based on accelerometer measurements. Lastly, it was found that the measurement system that we built was not suited for the problem at hand because the accelerometer bandwidth was too high and the system could not isolate the accelerometer from ambient noise. This led to a new measurement system design. However,...

Theoretical and Empirical Analysis of Path Magnetic Lane Tracking for the Intelligent Vehicle Highway System

Andrews, Angus
Rockwell International Science Center
1992

This report characterizes the statistical performance of the magnetic nails concept for estimating the positions of vehicles within their marked lanes. The report also presents a mathematical model for sensor noise due to the distortions of the earth field by regular patterns of ferrous reinforcing bars in the pavement.

Enabling Accelerated Installation of Aftermarket On-Board Equipment for Connected Vehicles

Chan, Ching-Yao
2012

This report summarizes previous findings and describes recent developments with regards to rapid introduction of aftermarket on-board equipment (OBE) devices for connected vehicles to the vehicle fleet. An integration assessment for aftermarket OBE devices will be discussed. An analysis of outside market forces that may affect driver adoption of connected vehicle technologies is shared. Finally, recommendations are provided for strategic approaches to foster the rapid introduction of aftermarket OBE devices and garner consumer interests to purchase these devices.

The Role of Advanced Traveler Information Systems in Incident Management

Al-deek, Haitham Mohammed
1992

This dissertation deals with the application of Advanced Traveler Information Systems (ATIS) in incident management. Using an idealized traffic corridor and deterministic queuing methods, conditions under which route guidance information is useful are identified. Benefits to traffic guided with ATIS are estimated and system performance is evaluated in diverse environments of non-recurring congestion.