Data

A Machine Vision System for Generating Vehicle Trajectories over Extended Freeway Segments

Kim, Zu Whan
Gomes, Gabriel
Hranac, Robert
Skabardonis, Alexander
ITS America
2005

An advanced machine vision system is presented that automatically extracts vehicle trajectories over long freeway sections from video data. For each vehicle, its dimension and initial position are robustly given by the vehicle detection algorithm, and a separate tracking algorithm is used to extract the vehicle’s trajectory from the images of multiple cameras. The algorithms overcome the limitations of machine vision algorithms previously proposed that have difficulty to robustly obtain accurate vehicle positions in the presence of shadows and occlusions. Using the system, we generated a...

A Framework for Validating Traffic Simulation Models at the Vehicle Trajectory Level

Xyntarakis, Michalis
Alexiadis, Vassili
Punzo, Vincenzo
Campbell, Robert
Skabardonis, Alex
2017

Based on current practices, traffic simulation models are calibrated and validated using macroscopic measures such as 15-minute averages of traffic counts or average point-to-point travel times. For an emerging number of applications, including connected vehicles, the realism of simulated driver dynamics at the second-by-second or sub-second trajectory level plays an important role. A framework to validate the realism of simulated vehicle dynamics at the trajectory level is presented in this report. Trajectory measures related to safety, comfort, vehicle kinematics, and traffic flow are...

Commuters' Normal and Shift Decisions in Unexpected Congestion: En Route Responses to Advanced Traveler Information Systems Volume 2

Polydoropoulou, A.
Ben-akiva, M.
Khattak, A.
Lauprete, G.
1996

Advanced Traveler Information Systems (ATIS) are being developed to provide travelers with real-time information about traffic conditions. To evaluate the benefits of ATIS products and services, questions concerning potential market, usage, and travel response must be addressed. This paper focuses on en-route travel response to ATIS. The main objective is to explore how travelers deal with unexpected congestion and how they might respond to qualitative, quantitative, prescriptive and predictive information. Data on travelers’ route switching decisions are obtained through a survey of...

Investigation of Elderly Driver Safety and Comfort: In-Vehicle Intersection “Gap Acceptance Advisor” and Identifying Older Driver Needs

Bougler, Benedicte
Cody, Delphine
Geyer, Judy
Horne, Jedidiah H.
Misener, James A.
Nowakowski, Christopher
Rodier, Caroline J., PhD
Ragland, David, PhD
Shaheen, Susan A., PhD
Caguimbaga, Joy
Daniels, Bevin
Hamel, Kathryn, PhD
2005

Our work in Toyota GapAdvise is comprised of two interrelated elements: identify driving task challenges, and a pilot study on one particular class of decision support system, an intersection gap advisor. From these elements, we have recommended countermeasures and potential design guidelines for the elderly driving population in the United States.We performed our work in the following sequence of technical tasks, each corresponding to a section heading in this final report:Determine Extent of Problem (Task 1). From crash databases and demographic data, we have determined the projected...

Use of NASS Data for Evaluation of AVCS Devices

Hitchcock, Anthony
1991

This report examines the applicability of the 1986 National Accident Sampling System (NASS) in providing sufficient information about a traffic accident to determine if an advanced vehicle control system (AVCS) could have had an impact in preventing that accident. The author states that, in general, NASS raw data are useful for evaluation of AVCS whenever a driver' s choices are limited to keeping a straight course at an appropriate speed

A Tool for the Incorporation of Non-Recurrent Congestion Costs of Freeway Accidents in Performance Management

Recker, Will
Chung, Younshik
Golob, Tom
2005

In this research, we develop and apply an analytic procedure that estimates the amount of traffic congestion (vehicle hours of delay) that is caused by different types of accidents that occur on urban freeways in California. A key feature of this research is the development of a method to separate the non-recurrent delay from any recurrent delay that is present on the road at the time and place of a reported accident, in order to estimate the contribution of non-recurrent delay caused by the specific accident. Our analysis involves a case study of accidents that occurred on freeways in...

Smart Call Box Field Operation Test Evaluation: Summary Report (revised Draft 5-1-97)

Banks, James H.
Powell, Patrick A. D.
1997

The Smart Call Box Field Operational Test evaluated the feasibility and cost-effectiveness of using smart call boxes for five data processing and transmission tasks: traffic census, incident detection, hazardous weather reporting, changeable message sign control, and video surveillance. Evaluation focused on assessing the cost-effectiveness of smart call boxes as compared with a baseline system using hardwire telephone communications. The evaluation was primarily based on functional adequacy and capital costs.

Development of Requirement Specifications for Transit Frontal Collision Warning System

Wang, Xiqin
Lins, Joanne
Chan, Ching-Yao
Johnston, Scott
Zhou, Kun
Steinfeld, Aaron
Hanson, Matt
Zhang, Wei-Bin
2003

The U.S. Department of Transportation (US DOT) initiated the Intelligent Vehicle Initiative (IVI) Program with the goal of improving safety through the application of advanced technologies. The frontal collision warning function has been identified as one of the key safety improvement measures for the transit vehicle platform of the IVI Program. Frontal collision, defined as a bus colliding with a vehicle in front of the bus, is a frequent incident in transit bus operations and the cause of property damage, personal injuries, and interruption to bus operations. A team that includes San...

California Trains Connected

Kanafani, Adib
Benouar, Hamed
Chiou, Bensen
Ygnace, Jean-Luc
Yamada, Kazuhiro
Dankberg, Adam
2006

This project is to assist the Capitol Corridor Joint Power Authority (CCIPA) and the California Department of Transportation (Caltrans) assemble a decision framework for selecting wireless Internet access on behalf of customers riding the three California State sponsored Intercity Rail Services. To accomplish this objective, we researched the state of worldwide deployment of service based on the wireless technologies, such as wireless fidelity (WiFi) and Worldwide Interoperability for Microwave Access(WiMAX), conducted a survey of the WiFi service at San Francisco Airport, and examined the...

Deliver a Set of Tools for Resolving Bad Inductive Loops and Correcting Bad Data

Lu, Xiao-Yun
Kim, ZuWhan
Cao, Meng
Varaiya, Pravin
Horowitz, Roberto
2010

This report documents a practical work conducted at California PATH for developing a portable tool to be used at the control cabinet level to accurately diagnose any fault(s) of a loop detection system (including loop circuits, loop cards, cable links, etc.), to check the detection accuracy, to deal with sensitivity of detector card, and to correct the faulty data. To achieve these functionalities at the low level, it is necessary to utilize an independent source as a baseline data to compare against the loop detection system output. Such a comparison also permits an evaluation of the loop...