PATH

PATH Task Order 6329 has as its two main goals 1) to create a software tool which can be used to design and test ramp metering systems for freeways, and 2) to prepare necessary software to conduct a field test of a queue control algorithm developed under T.O. 5503. Both of these objectives are directed towards improving the effectiveness of ramp metering strategies for freeways by using advanced technologies in traffic sensors (Sensys), data storage (PeMS), and ramp metering algorithms (Alinea, SWARM).The Ramp Metering Design Tool (RMDT) has been designed to meet the first of these goals....

An important perceptual task during driving is the ability to detect and avoid collisions. Failure to accurately perform this task can have serious consequences for the driver and passengers. The present research developed and tested a model of car following by human drivers, as part of a general model under development of a human driver. Unlike other car following models that are based on 3D parameters (e.g., range or distance) the present model is based on the visual information available to the driver. The model uses visual angle and change in visual angle to regulate speed during car...

This report reviews the recent studies adopted in order to understand drivers' behavior, and in particular, behavior when influenced by an Advanced Traveler Information System (ATIS). Different approaches were used in these studies: field experiments, route choice surveys, interactive computer simulation games, route choice simulation and/or modeling, and stated preference. These studies are classified according to the main approach used, and the main objective, method, and findings are presented. Results indicate the need to understand how drivers choose or change routes in the absence of...

In this report, we develop nonlinear dynamical models and longitudinal control algorithms that coordinate variable compression brake mechanism with service brakes for a Class-8 commercial heavy vehicle. For the coordination and full use of these retarding actuators, we model the multivariable system based on physics-based principles and experimental data. We show that, for one specific critical braking maneuver, the coordination of compression and service brakes reduces the use of the service brakes by a factor of 45, and that it reduces the settling time by a factor of 2. Key words:...