Data

Commercially-off-the-Shelf (COTS) and Emerging Technologies Sensor Testing and Evaluation

Sharafsaleh, Ashkan
2006

This report addresses Task S of the Intersection Decision Support (IDS) project funded by Federal Highway Administration (FHWA) and Caltrans. The objective of Task S is to evaluate and select Commercially-Off-The-Shelf (COTS) and emerging technology products that could eventually be deployed at intersections as part of the IDS system. Many sensors were considered and every plausible detection technology was reviewed for this task. The emphasis was on finding sensors that detect and track vehicle movements.This effort started with establishing a background and general guidelines for what...

Cybersecurity of Our Transportation Ecosystem

Peterson, Brian
2022

Cybersecurity has become a critical issue in today’s world. In the past, security of our cyberspace was an important issue for some sectors of the economy, especially those dealing with financial information, personal identification related information, corporate systems and trade secrets, government classified information, and other types of data considered valuable targets for hackers. For other sectors, there was much less attention and resources dedicated to protection of our information and control systems. These sectors were often considered less likely to be targeted and a less...

TRACER: In-vehicle, GPS-based, Wireless Technology for Traffic Surveillance and Management

McNally, M. G.
Marca, J. E.
Rindt, C. R.
Koos, A. M.
2003

The fundamental principle of intelligent transportation systems is to match the complexity of travel demands with advanced supply-side analysis, evaluation, management, and control strategies. A fundamental limitation is the lack of basic knowledge of travel demands at the network level. Modeling and sensor technology is primarily limited to aggregate parameters or micro-simulations based on aggregate distributions of behavior. Global Positioning Systems (GPS) are one of several available technologies which allow individual vehicle trajectories to be recorded and analyzed. Potential...

GPS-Aided Gyroscope-Free Inertial Navigation Systems

Park, Sungsu
Tan, Chin-Woo
2002

A gyroscope-free inertial navigation system uses only accelerometers to compute navigation trajectories. It is a low-cost navigation system, but its output error diverges at a rate that is an order faster than that of a conventional gyroscope-based system. So integration with an external reference system, such as the Global Positioning System, is necessary for long-term navigation applications. In this pa-per, an integrated GPS and gyroscope-free INS system is designed to achieve stable long-term navigation. The linear and nonlinear error models of a gyroscope-free INS are derived and are...

The Mass Transit Needs Of A Non-driving Disabled Population

Golledge, Reginald G.
Costanzo, C. Michael
Marston, James R.
1996

This paper examines further characteristics of the activity patterns of blind and vision impaired non-driving populations previously discussed in PATH Database Reference No. The report begins with an exploration of the activity patterns of blind or vision impaired people, followed by an evaluation of the impact of non-driving on employability and movement potential of the disabled non-driving group. The results of a survey of blind and vision impaired users of public transit facilities are then examined. Travel behavior characteristics and travel modes are studied. Possible assistive...

Comparative Analysis of Pedestrian Injuries Using Police, Emergency Department, and Death Certificate Data Sources in North Carolina, US, 2007–2012

Sandt, LS
Proescholdbell, S
Evenson, K
Robinson, W
Rodriguez, D
Harmon, K
Marshall, S
2020
Pedestrian safety programs are needed to address the rising incidence of pedestrian fatalities. Unfortunately, most communities lack comprehensive information on the circumstances of pedestrian crashes and resulting injuries that could help guide decision-making for prevention program development and implementation. This study aimed to evaluate how three commonly available data sources (police-reported pedestrian crashes, emergency department [ED] visits, and death certificates) define and capture pedestrian injury data, and to compare the distribution of pedestrian injuries and fatalities...

Monitoring The San Francisco Bay Area Freeway Network Using Probe Vehicles And Random Access Radio Channel

Linnartz, Jean-paul M. G.
Westerman, Marcel
Hamerslag, Rudi
1994

In this report, the authors describe a method of collecting real-time traffic data from probe vehicles automatically sending traffic reports to one or m ore base stations, connected to a traffic center by a wired communications network. Analyzing and computing road traffic and message traffic flows in the San Francisco Bay Area, the authors study several multi-disciplinary aspects of this data collection technique. The results presented in this report reveal that random access (ALOHA) transmission of traffic messages is a (spectrum) efficient, inexpensive and flexible method for collecting...

Transit Service Integration Practices: An Assessment of U.S. Experiences

Miller, Mark A.
Englisher, Larry S.
Halvorsen, Rick
Kaplan, Bruce
2005

This report presents the results of its assessment of transit service integration practices in the United States. Initially, a review of the literature was performed that identified the various types of service integration policies that have been and are being implemented including infrastructure, schedule, information, fare payment and special events/emergency service integration. The review also revealed how the introduction of service integration practices is part of overall changes in transit properties' way of conducting business. The research then made use of a twostage survey of...

Design, Field Implementation and Evaluation of Adaptive Ramp Metering Algorithms

Horowitz, Roberto
May, Adolf
Skabardonis, Alex
Varaiya, Pravin
Zhang, Michael
Gomes, Gabriel
Munoz, Laura
Sun, Xiaotian
Sun, Dengfeng
2005

The main objectives of Task Order 4136 are (1) the design of improved freeway on-ramp metering strategies that make use of recent developments in traffic data collection, traffic simulation, and control theory, and (2) the testing of these methods on a 14-mile segment of Interstate 210 Westbound in southern California. To date, the major accomplishments of this project include (i) the development of a complete procedure for constructing and calibrating a microscopic freeway traffic model using the Vissim microsimulator, which was applied successfully to the full I-210 test site, (ii) a...

Providing In-Vehicle Soft Safety Alerts Using Mobile Millennium Data and Vehicle Event Information

Nowakowski, Christopher
Gupta, Somak Datta
Myers, Scott
Shladover, Steven
Butler, Joe
Bayen, Alex
2012

The Mobile Millennium project provided a platform for aggregating traffic information across various sources, including infrastructure sensors, commercial data feeds, probe vehicles, and probe cell phones. The Networked Traveler project provided the California PATH instrumented research vehicle platform used to both deliver vehicle probe data back to the infrastructure and to generate Advanced Driver Assistance Systems (ADAS) alerts to the drivers of those vehicles. The main theme of this collaboration project was to demonstrate the potential to create Enhanced Probe Vehicles (EPVs) by...