Data

Adaptive Baud Protocol For Wireless Communication

Eskafi, F. H.
Nassiri-toussi, K.
Liu, G.
1998

In this paper, the authors propose an algorithm that increases and decreases the transmission speed according to a user-specified function. The design objective is to regulate baud as efficiently as possible and ensure that in each transmission interval, transmitter and receiver bauds are equal for some period of time during data transmission. An equivalent discrete-time version of the protocol is verified by using the COSPAN software. Application for this adaptive baud protocol for wireless communication is seen in a platoon setting within an Automated Highway System (AHS).

GPS/GIS Technologies for Traffic Surveillance and Management: A Testbed Implementation Study

McNally, M.G.
Marca, J.E.
Rindt, C.R.
Koos, A.M.
2002

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...

Highway Traffic Data Sensitivity Analysis

Lu, Xiao-Yun
Coifman, Benjamin
2007

This report is divided into two parts:•Part I - Highway Traffic Data Sensitivity Analysis in Systems Approach. This work has been conducted by Dr. Xiao-Yun Lu at California PATH, U. C. Berkeley.•Part II - Empirical and Analytical Results for Sensitivity to Loop Station Spacing. This work has been conducted by Benjamin Coifman in Civil Engineering, Ohio State University.Since the aspects of the problem considered and approaches adopted by the two are different, it is thus necessary to separate the report into two parts. Each part is self-content.

Truck CACC Implementation, Field Test and Data AnalysisResults

Lu, Xiao-Yun
2018

This report documents the CACC implementation and field tests for Class-8 trucks. The CACC system design for this implementation has been documented in a separate report. The field tests include two types: some limited freeway tests for control system tuning and development purposes, and extensive tests of fuel consumption at Transport Canada’s Motor Vehicle Test Centre near Montreal. Although the objective of the latter test was for fuel economy analysis of CACC operations, the data have been used for CACC performance analysis in this report since most of the fundamental scenarios have...

PLANTiS: Organization And Integration Of Modules

Paramsothy, Thananjeyan
Khattak, Asad
Lovell, David
Kanafani, Adib
1995

This paper discusses the integration of PLANiTS (Planning and Analysis Integration for Intelligent Transportation Systems) components. The integration is achieved by defining a structure for representing transportation improvement actions, performance measures and environment in terms of spatial, temporal and user dimensions. A discussion is also presented on the key issues related to computer implementation including data dimension, a data dictionary, data modeling, and data transformations. A basis is developed for the next implementation of PLANiTS.

Smart Corridor Evaluation Plan: Conceptual Design

Miller, Mark
Khattak, Asad
Hall, Randolph
Giuliano, Genevieve
Moore, James
Wachs, Martin
1994

This report presents the Conceptual Design Plan for evaluating the effectiveness of the Smart Corridor Demonstration Project. The specific objectives of this report are to: 1) develop a conceptual structure for the Smart Corridor evaluation, 2) define evaluation data requirements and collection procedures, and 3) select and/or develop data reduction and data analysis methodologies. Overall, the Smart Corridor is designed to obtain improved utilization of existing roadway facilities, both freeway and arterial, through the use of Advanced Traveler Information Systems ( ATIS) and Advanced...

Improving the Traffic Census and Highway Performance Monitoring System (HPMS) Programs

Mauch, Michael, PhD
Skabardonis, Alex, PhD
2020

The objective of this research study was to support the Traffic Census and Highway Performance Monitoring System (HPMS) Programs in identifying locations for motorized traffic data collection on public roads in California. The study analyzed the traffic census count locations for each District to determine at which Census count locations the automated and continuously collected Caltrans Performance Measurement System (PeMS) data could be used in lieu of manual traffic counts. Next, this research identified and evaluated count locations for motorized traffic data collection on non-State...

Improving the Traffic Census and Highway Performance Monitoring System (HPMS) Programs

Mauch, Michael, PhD
Skabardonis, Alex, PhD
2020

Between 2017 and 2019, California experienced a series of devastating wildfires that together led over one million people to be ordered to evacuate. Due to the speed of many of these wildfires, residents across California found themselves in challenging evacuation situations, often at night and with little time to escape. These evacuations placed considerable stress on public resources and infrastructure for both transportation and sheltering. In the face of these clear challenges, transportation and emergency management agencies across California have widely varying levels of preparedness...

Field Experiment of Variable Speed Advisory (VSA) Final Report

Lu, Xiao-Yun
Spring, John
Wu, Cheng-Ju
Nelson, David
Kan, Yuheng
2019

This report documents the field test of Variable Speed Advisory (VSA) which is an Active Traffic Management strategy. The test site for the VSA is on State Route 78 Eastbound (SR-78E) from Vista Village Drive (in the City of Vista) to the freeway interchange point of SR-78E and U.S. Route 15 (in the city of Escondido). This test segment is a three-lane freeway with a posted speed limit of 65 mph and it has 10 on-ramps and 10 off-ramps. The project was funded by the California Department of Transportation (Caltrans) Division of Research Innovation and System Information (DRISI) under...

Bicycle Detection and Operational Concept at Signalized Intersections

Shladover, Steven E.
Kim, ZuWhan
Cao, Meng
Sharafsaleh, Ashkan
Li, Jingquan
Leung, Kai
2009

In support of efforts to improve traffic signal timing to accommodate the needs of bicyclists, observations have been made of the timing of bicyclists’ intersection crossing maneuvers. Video recordings were made of bicyclists’ crossings and the video images were processed to extract the bicyclists’ trajectories. These were synchronized with video images of the traffic signals so that the timing of the bicyclists’ maneuvers could be determined relative to the signal phase. The processed data have yielded cumulative distributions of the crossing speeds of bicyclists who did not have to stop...