Roads/Highways

Optimal Preview Control For Vehicle Lateral Guidance

Peng, Huei
Tomizuka, Masayoshi
1991

This report introduces an optimal preview control algorithm which utilizes preview information pertaining to road curvature as well as superelevation angle for vehicle lateral control purposes. The optimal control law consists of both feedback control action and feedforward preview control action. The feedforward preview control action significantly improves tracking performance while maintaining a small closed loop bandwidth so ride quality is not impaired. Frequency domain analyses and numerical simulation results show improvements obtained in both frequency domain and time domain

Opportunities And Constraints For Advanced Highway Technologies: A Speculative Analysis

Deakin, Elizabeth
1989

Might the performance of transportation systems be significantly improved through greater application of emerging technologies? Recent advances in computers, materials, communications, control systems, information systems, and many other areas raise intriguing possibilities.

Potential Benefits Of In-vehicle Information Systems In A Real Life Freeway Corridor Under Recurring And Incident-induced Congestion

Al-deek, Haitham
1988

Optimal use of existing transportation facilities has become a major priority in congested urban areas. Providing real-time in-vehicle traffic information to drivers is one possibility of achieving this goal. This report documents an initial attempt to ascertain the potential benefits of a real-time in-vehicle traffic information system under recurring and non-recurring congestion conditions.

Final Report: Mobile Surveillance and Wireless Communication Systems Field Operational Test Volume 3: Appendices A-J Containing Evaluation Data Gathered During the Anaheim Special Event and I-5 Tests

Klein, Lawrence
1999

The Mobile Surveillance and Wireless Communication Systems Field Operational Test(FOT) contained two evaluation tests, the Anaheim Special Event Test and theInterstate-5 (I-5) Test. The Anaheim Special Event Test assessed the ability of thesurveillance trailers to transmit video imagery to a traffic management center in supportof arterial traffic signal control. This test occurred during the Spring of 1997 inconjunction with heavy traffic experienced during hockey playoff games at theArrowhead Pond in Anaheim, CA. The I-5 Test evaluated the ability of the mobilesurveillance and ramp meter...

Evaluation of Coordinated Ramp Metering (CRM) Systems in California

Mauch, Michael
Skabardonis, Alexander
2021

Freeway on-ramp metering (RM) has been extensively used as a traffic control strategy to regulate the entry of the on-ramp vehicles to prevent congestion at the freeway merging areas and preserve the freeway capacity. Benefits of RM include improved freeway travel times, improved travel time reliability, and accident reductions. Fixed-rate ramp metering strategies are based on historical data and implemented by time of day. Traffic responsive RM strategies are based on real time freeway traffic data provided by loop detectors at the vicinity of the on-ramp. Coordinated RM determine the...

Low Speed Collison Dynamics And Control: Year One Report

Tongue, Benson H.
Moon, Ahrie
1995

This report discusses the issues investigated during the first phase of a project which focuses on the development of a simulation program which will allow the study of platoon dynamics in both nominal and emergency scenarios. Preliminary issues include collision detection between the vehicles within the platoon and determining the platoon's post-crash behavior. A two-dimensional vehicle has been developed to addresses these issues. The overall simulation program includes individual modules that supply control input force, aerodynamic drag force, and road-tire interaction forces....

Evaluation Of The Freeway Service Patrol ( F S P ) In Los Angeles

Skabardonis, Alexander
Petty, Karl
Varaiya, Pravin
Bertini, Robert
1998

This report presents the results of a study designed to evaluate the effectiveness of the freeway service patrols (FSP) on a section of I-10 in Los Angeles. An evaluation methodology was used to estimate incident delays based on loop detector data and probe vehicles, and derive estimates of savings in performance measures in the absence of data for before FSP conditions. The estimated benefit cost ratios based on delay and fuel savings for a range of typical reductions in incident durations indicate that FSP produces significant benefits at the test site. Additional benefits include...

A General Framework for Verification, Simulation and Implementation of Real-Time Control Algorithms

Eskafi, Farokh H.
1999

We have proposed, investigated, and implemented a general framework for the simulation, verication, and prototyping of control algorithms for intelligent vehicles and highways. The immediate use of such frame work will be in fault management project (MOU288). Prior to this project the protocols and control algorithms developed under MOU288 should have been manually verfied, translated to a simulation language for simulation, and then modified for the QNX real-time operating system for porting to the vehicle's computer. This manual translation process is error prone at every stage. Our...

Freeway Service Patrol Evaluation

Skabardonis, Alexander
Noeimi, Hisham
Petty, Karl
Rydzewski, Dan
Varaiya, Pravin
Al-deek, Haitham
1995

This report presents the findings of a comprehensive evaluation of the freeway service patrol (FSP) program on specific freeway section in the San Francisco Bay Area. The study methodology consisted of determining the savings in incident delay and other performance measures "before" and " after" the implementation of FSP based on field data and improved analysis procedures. Data were collected during the peak periods on a mile section of the I-880 freeway in the City of Hayward, Alameda County. Software was developed to process the field data and create a computerized database. Benefits of...

Freeway Analysis Manual: Parts 1 and 2

May, Dolf
Leiman, Lannon
2005

This Freeway Analysis Manual is intended for those who are responsible for understanding, analyzing, and evaluating the operations of freeways for planning, design, and operational improvements of such facilities. Freeway analysis requires a creative person, knowledgeable in freeway analysis fundamentals, having good traffic data, and selecting appropriate analytical tools.