Connected and Automated Vehicles

Transient Aerodynamics in Vehicle Interactions: Data Base Summary

Chen, A.L.
Hedrick, K.
Savas, O.
1998

The vehicles in a platoon will experience transient aerodynamic forces as vehicles leave and join the platoon at various locations. A platoon of scale vehicle models is placed in a wind tunnel and measurements are made of the transient forces and moments as one of the vehicles is moved into and out of the platoon. The results from the wind tunnel experiments will allow the computer vehicle control algorithms to better predict the transient aerodynamics the vehicles in the platoon will encounter during leaving and joining maneuvers.Since a lane change (either leaving or joining a platoon)...

Fuzzy Logic Control For Lane Change Maneuvers In Lateral Vehicle Guidance

Hessburg, Thomas
Tomizuka, Masayoshi
1995

This paper investigates the feasibility of a fuzzy logic control (FLC) algorithm for lateral control in a lane change maneuver in an automated highway system (AHS). The lane change maneuver takes the vehicle from lane following control in one lane to lane following control in an adjacent lane. A lateral accelerometer is the only sensor used for feedback during the maneuver. The rules of the FLC are developed based on human driving experience.

LANE-OPT Users Manual Version 1.0

Lotspeich, David
Hall, Randolph W.
1996

This document is the user manual for LANE-OPT. LANE-OPT is a linear program based software package that optimally assigns traffic to lanes on an automated highway. The program is based on a workload model, such that each lane/segment has a fixed capacity than can be allocated among: (1) straight traffic, (2) lane changes into the lane, (3) lane changes out from the lane, and (4) lane changes that pass through the lane. Each of these four movements produces a user-specified workload. The computer program models the highway as a multi-commodity flow network, where commodities represent...

Dynamic Modeling Of Tractor-semitrailer Vehicles In Automated Highway Systems

Chen, Chieh
Tomizuka, Masayoshi
1995

This report is concerned with the dynamic modeling of the tractor- semitrailer vehicles in Automated Highway Systems (AHS). The objectives of the research are to characterize the dynamic response of articulated heavy-duty vehicles, identify the key system parameters, develop control algorithms to achieve automatic guidance, and conduct experiments on lateral guidance control of articulated heavy-duty vehicles. A modeling approach for roll, pitch and yaw motions of tractor-semitrailer vehicles is described.

Robust Multiple Car Tracking With Occlusion Reasoning

Koler, Dieter
Weber, Joseph
Malik, Jitendra
1994

In this paper, the authors address the problem of traffic surveillance in an Advanced Transportation Management System. They propose a new approach for detecting and tracking vehicles in road traffic scenes that attains a level of accuracy and reliability which lies beyond currently available systems. High accuracy and reliability are obtained by using an explicit occlusion reasoning step, employing a contour tracker based on intensity and motion boundaries.

AHS Deployment: A Preliminary Assessment of Uncertainties

Hall, Randolph W.
Tsao, H.-S. Jacob
1994

This paper provides a preliminary assessment of uncertainties, both technical and institutional, associated with the deployment of Automated Highway Systems (AHS). Seven issues are addressed, concerning whether: (1) People use AHS, ( 2 ) Auto makers manufacture equipped vehicles, (3) Government builds AHS roadways, (4)Highways can evolve, ( 5 ) Interest groups do not obstruct, (6) Performance is adequate, and (7) Technology is feasible. For each issue, a table is provided that lists some of the more critical uncertainties.

Vehicle Lateral Warning, Guidance and Control Based on Magnetic Markers: PATH Report of AHSRA Smart Cruise 21 Proving Tests

Tan, Han-Shue
Bougler, Bndicte
2001

This report details the PATH proving test results during the period of October 6 to December 1, 2000 on the test track of the Public Works Research Institute (PWRI) of the Ministry of Construction in Tsukuba City, Japan. This work is related to the "Attachment 5: System Evaluation by Proving Test, Section 2.2 Evaluation by Proving Test" to the "Implementation Plan for Advanced Cruise-Assist Highway System Technical Research Development for FY2000" with respect to the "Entrusted Study" entrusted in FY2000 by the "Public Works Research Institute of the Ministry of Construction" to the "...

Current and Future Transportation Management High-Level Requirements Technical Memorandum

Zeinali Farid, Yashar
Peterson, Brian
Harrington, Michelle
2021

This document presents a review of the current and future requirements for information exchange between traffic management centers, with emphasis on the changes expected due to the changing nature of transportation and the advances in technology that are becoming prevalent in the transportation ecosystem. The intent of this document is to provide a look at the source of changes required within center-to-center communication and new requirements that will need to be addressed as transportation undergoes significant change due to new transportation modes, technology advances in connected and...

Analysis, Design, And Evaluation Of AVCS For Heavy-duty Vehicles: Phase 1 Report

Yanakiev, Diana
Kanellakopoulos, Ioannis
1995

This report addresses the problem of automation of heavy-duty vehicles. After a brief description of the dynamic model used in the design and simulations, the authors develop nonlinear controllers with adaptation, first for speed control and then for vehicle follower longitudinal control. Both autonomous operation as well as intervehicle communication are considered, and the performance of the controllers in several different scenarios through simulation are evaluated.

Safety and Efficiency Tradeoff Analysis for Automated Highway System: Part 3: Longitudinal Separation on AHS: A Trade-off Between Collision Probability/Severity and Capacity

Tsao, H.-S. Jacob
Hall, Randolph W.
1997

This report develops a probabilistic model for analyzing longitudinal collision/safety between an abruptly decelerating vehicle and its immediate follower on an Automated Highway System. The input parameters are the distance between the two vehicles, their common speed prior to the failure, the reaction delay of the following vehicle and a bivariate distribution for the two deceleration rates. The output includes the probability of a collision and the probability distribution of the relative speed at collision time. These safety consequences can be used to balance the desire to increase...