Traffic Operations and Management

Stated and Reported Route Diversion Behavior: Implications on the Benefits of ATIS

Khattak, Asad
Kanafani, Adib
Le Colletter, Emmanuel
1994

This report presents a study in which Advanced Traveler Information Systems (ATIS) user benefits are estimated from a survey of commuting behavior undertaken in the San Francisco Bay Area in 1993. Both reported and stated response to unexpected congestion are used to determine the commuters who would directly benefit from qualitative, quantitative and predictive, as well as prescriptive ATIS information

Stated and Reported Diversion to Public Transportation in Response to Congestion: Implications on the Benefits of Multimodal ATIS

Khattak, Asad
Le Colletter, Emmanuel
1994

The objective of this study is to evaluate the potential benefits of a multimodal Advanced Traveler Information System (ATIS). The propensity of auto commuters to switch to public transportation in response to unexpected traffic congestion is investigated using a detailed survey undertaken in the Golden Gate Bridge corridor in 1993. A stated preference analysis tied to the situation for which the commuting behavior was reported is used to estimate the propensity of travelers to divert to transit under a multimodal ATIS.

Fuzzy Traffic Density Homogenizer for Automated Highway Systems

Chien, C. C.
Ioannou, P.
Chu, C.K.
1995

In this paper, a fuzzy traffic density homogenizer is proposed to alleviate or avoid congestion by smoothing the traffic density distribution profile over freeway lanes. The proposed fuzzy homogenizer consists of two parts: the fuzzy mean speed controller and the fuzzy on- ramp controller. Simulation results are used to demonstrate that the proposed controllers can eliminate traffic flow instabilities leading to smooth traffic flows.

Bay Area ATIS Testbed Plan

Khattak, Asad
Al-Deek, Haitham
Yim, Youngbin
Hall, Randolf
1992

Several factors have motivated the development of Intelligent Vehicle Highway Systems (IVHS); among them are growing traffic congestion, concern for environmental degradation, the need to improve safety, and the desire to best utilize existing transportation infrastructure. Within the framework of M-IS, Advanced Traveler Information Systems (ATIS) will provide historical, real-time and predictive information to support travel decisions. ATIS offers significant benefits interms of improving the travel experience of individuals and enhancing system performance. In the long-term, ATIS may...

Multiple ICM Management: Task ID 3706 (65A0764), Final Report

Patire, Anthony PhD
Dion, Francis PhD
2022

In order to improve corridor network operations, the vision of integrated corridor management (ICM) is to identify corridor managers who serve as experts for individual corridors, and to enable these managers to oversee corridor operations, to coordinate with partner agencies, and to improve collaborative, multiagency planning. While it makes sense to manage freeways, arterials, and transit in a coordinated way within a corridor, it is less clear how multiple corridors interact with each other, and how incidents and response plans along one corridor impacts a nearby corridor or multiple...

Towards an Accessible City: Removing Functional Barriers to Independent Travel for Blind and Vision-Impaired Residents and Visitors

Golledge, Reginald G.
Marston, James R.
1999

This study examined the effect that use of Remote Infrared Signage Systems has on performance of blind or vision impaired people when undertaking a variety of bus user tasks, including finding a suburban bus stop, identifying a specific bus and boarding it, disembarking at the downtown terminal and finding the entrance, traversing the terminal and learning the location of facilities inside and simulating the exiting of a buss.

Some Theoretical Aspects of the Benefits of En-Route Vehicle Guidance (ERVG)

Al-Deek, Haitham M.
Kanafani, Adib K.
1989

This paper concerns the benefits from vehicle route guidance in urban networks. We suppose that vehicle routes can be altered by En-Route Vehicle Guidance (ERVG) in such a way as to achieve system optimal assignment. Benefits are measured by the savings in total travel time for a given demand when comparing this assignment with the user equilibrium, which is assumed to occur in the absence of route guidance. A continuum approach is used to analyze some idealized corridors in which a freeway is superimposed over a dense grid of surface streets. Two cases are considered: in the first, the...

Final Report: Mobile Surveillance and Wireless Communication Systems Field Operational Test; Volume 1: Executive Summary

Klein, Lawrence
1999

The Mobile Surveillance and Wireless Communication Systems Field Operational Test (FOT) evaluated the performance of wireless traffic detection and communications systems in areas where permanent detectors, electrical power, and landline communications were not available. The FOT partners designed and built six surveillance and three ramp meter trailers, a video and data retransmission or relay site, and video and data reception facilities at the Caltrans District 12 and Anaheim Traffic Management Center (TMCs) and the University of California at Irvine Institute of Transportation Studies...

Experimental Verification of Discretely Variable Compression Braking Control for Heavy Duty Vehicles: Final Report

Vahidi, Ardalan
Stefanopoulou, Anna G.
Wang, Xiaoyong
Tsao, Tsu Chin
2004

In the first two chapters of this report, the development of discrete compression brake and transmission models is explained. In the vehicle model development, special efforts have been put in transmission shifting scheduling. Transmission up-shift and down-shift scheduling are separated in the modelling. Hysteresis during shifting is introduced to reduce chattering. A compression brake effect on transmission shifting is identified and considered in the modelling. The new transmission shifting model has been validated through experimental data. The transmission shifting model is combined...

Study of Integrated Corridor Management for San Francisco Bay Area I-880 Corridor

Zhang, Wei-Bin
Li, Irene
Shladover, Steven
Li, Meng
Alm, Erik
Ban, Jeff
Victor, Radiah
Yee, Albert
Stanislaus, Danielle
Chow, Alan
Nozzari, Sean
Minoofar, Cyrus
Yarjani, Bijan
Spencer, Tina
Broadbent, Patricia
Alexiadis, Vassili
Hatata, Tarek
Nejad, Anush
Shamskhou, Habib
2008

This document summarizes the efforts by the San Francisco Bay Area ICM team to develop the concept of operation, data needs and performance requirements for an Integrated Corridor management System for I-880 Corridor. Although the transportation management systems at the Bay Area are consistent with the regional ITS plans, these management systems are less integrated. It is believed that higher lebel of intergration among freeway and arterial systems, transit systems with consideration of all transportation needs demands in the region will greatly enhance and improve the efficiency and...