PATH

Development of a Modeling Framework for Analyzing Improvements in Intermodal Connectivity at California Airports

Lu, Xiao-Yun
Gosling, Geoffrey D.
Shladover, Steven E.
Xiong, Jing
Ceder, Avi
2006

This report has been prepared as part of a research project developing a combined quantitative and qualitative approach to planning for improved intermodal connectivity at California airports. The quantitative approach involves the development of an Intermodal Airport Ground Access Planning Tool (IAPT) that combines an air passenger mode choice model, a model of transportation provider behavior and a traffic network analysis model. The qualitative approach will be used to enhance the quantitative analysis to account for those factors which are difficult to quantify and to provide...

Mixed Manual/Semi-Automated Traffic: A Macroscopic Analysis

Bose, Arnab
Ioannou, Petros
2001

The use of advanced technologies and intelligence in vehicles and infrastructure could make the current highway transportation system much more efficient. Semi-automated vehicles with the capability of automatically following a vehicle in front as long as it is in the same lane and in the vicinity of the forward looking ranging sensor are expected to be deployed in the near future. Their penetration into the current manual traffic will give rise to mixed manual/semi-automated traffic. In this paper, we analyze the fundamental flow-density curve for mixed traffic using flow-density curves...

Congestion-Responsive On-Ramp Metering: Recommendations toward a Statewide Policy

Lu, Xiao-Yun
Amini, Zahra
Mauch, Michael
Skabardonis, Alexander
2019

The objective of this project was to develop recommendations toward a statewide policy of congestion responsive freeway ramp metering (CRRM) operation. The research has been performed in the following approaches: First an empirical “before” and “after” freeway corridor performance evaluation was performed on a selected set of California’s freeway corridors that had implemented congestion responsive ramp metering. Next, other important policy and operational factors that impact the effectiveness of extended hours ramp metering were evaluated: traffic detector health and data quality and...

Integrated Ramp Metering Design and Evaluation Platform with Paramics

Chu, Lianyu
Recker, Will
Yu, Guizhen
2009

Ramp metering has been recognized as an effective freeway management strategy to either avoid or ameliorate freeway traffic congestion by limiting access to the freeway. California has applied ramp metering widely in major metropolitan areas. Currently, California has three major ramp metering systems: San Diego Ramp Metering System (SDRMS), Semi-Actuated Traffic Management System (SATMS), and Traffic Operations System (TOS). Although the ramp metering algorithms that underlay these systems are based on relatively simple theoretical concepts, these real-world ramp metering systems are...

Automated Highway System Field Operational Tests For The State Of California: Potential Sites, Configurations And Characteristics

Hall, Randolph W.
Thakker, Viral
Horan, Thomas A.
Glazer, Jesse
Hoene, Chris
1997

This report describes possible objectives for a Field Operational Test (FOT), to be conducted following the completion of the National Automated Highway System Consortium (NAHSC) mission in 2002. At that time, it is anticipated that there will be one or more FOTs in which ordinary drivers will use automated vehicles on a real roadway, under test conditions. The report also identifies potential test sites in California, and evaluates the merits of these sites for conducting different types of tests.

Simple Results on Communication With Neighbors

Puri, Anuj
Varaiya, Pravin
1999

Normal Communication Networks require the Sender to specify the address of the Receiver before communication can take place. In problems that a rise in an Automated Vehicle Highway System, the Sender can identify the Receiver by its physical location only (i.e. a car wanting to communicate with the car immediately in front of it). Normal Communication Procedures that use the Receiver's Address to establish communication must be preceded by an Address Finding Protocol. An Address Finding Protocol which uses the Absoulate Location of vehicles has been proposed in [2] and is reviewed in...

Development and Testing of Field-Deployable Real-Time Laser-Based Non-Intrusive Detection System for Measurement of True Travel Time on the Highway

Cheng, Harry H.
Shaw, Ben
Palen, Joe
Hu, Xudong
Lin, Bin
Larson, Jonathan E.
Van Katwyk, Kirk
2001

We have developed a field prototype of a laser-based non-intrusive detection system for real-time measurement of delineations of moving vehicles for highway testing, based on our previous research on the laboratory prototype of the system. The primary goal of this project is to develop a roadway detection system that can be used to gather reliable travel time data non-intrusively. The system uses a laser line that is projected onto the ground as a probe. The reflected light is collected and focused into a photodiode array by an optical system. Vehicle presence is detected based on the...

Evaluate IST-222 Loop Detector System

Gomes, Gabriel
2009

This report documents work performed under PATH Task Order 5314. The objective of this project has been to assess the potential benefits of a new loop detector card manufactured by Inductive Signal Technologies: the IST-222. The attractive features of this card include a) automatic detection of interference from nearby detectors, b) automatic sensitivity selection, c) high sample rates, d) real time noise attenuation, e) vehicle classification, and f) a USB port on the front panel. The evaluation was carried out in three phases: 1) a simple replacement of existing cards with new IST-222...

CARTESIUS and CTNET - Integration and Field Operational Test

McNally, Michael G.
Rindt, Craig R.
2010

This report describes the conclusion of PATH Task Order 6324: CARTESIUS and CTNET---Field Operational Test. We describe the results of the multi-year project focused on integrating Caltrans primary signal management system, CTNET, with a major product from the Caltrans ATMS Testbed: the Coordinated Adaptive Real-Time Expert System for Incident management in Urban Systems, or more simply, CARTESIUS. The major products of this research include numerous software products for integrating CTNET with field devices, simulation software, with other traffic management systems in general, and with a...

Red-Light-Running Collision Avoidance: Final Report

Grembek, Offer
Zhou, Kun
Li, Irene
Li, Meng
Zhang, Wei-Bin
Zou, Zhijun
2009

Red-Light-Running (RLR) is the leading cause of urban crashes. This report presents the findings from an investigation of signal control-related countermeasures to reduce the occurrences of RLR and related collisions. The objectives of this study were to identify and evaluate potential modifications to signal timing schemes in reducing the frequency of RLR and to develop online adaptive RLR collision avoidance algorithms to reduce the possibility of RLR collisions. High quality, second-by-second vehicle count and signal timing and phasing data were collected at arterial intersections. A...