PATH

A Theory Of Traffic Flow In Automated Highway Systems

Broucke, M.
Varaiya, P.
1995

This paper presents a theory for automated traffic flow, based on abstraction of vehicle activities such as entry, exit and cruising, derived from a vehicle's automatic control laws. The theory formulates TMC traffic plans as the specification of the activities and speed of vehicles, and the entry and exit flows for each highway section. The theory permits the study of transient phenomena such as congestion, and TMC feed back traffic rules designed to deal with transients.

Large-Scale Traffi c Simulation Through Distributed Computing of Paramics

Liu, Henry X.
Ma, Wenteng
Jayakrishnan, R.
Recker, Will
2004

Simulation modeling is an increasingly popular and effective tool for analyzing transportation problems, which are not amendable to study by other means. We examine the need for parallel or distributed simulation approaches from the need for computational speed-ups, availability of options towards that, and then at the need to distribute the effort to develop network simulation contexts and datasets. After an overview of the general techniques for the distributed discrete-event simulation and previous efforts on the distributed traffic simulation, we present the general architecture of the...

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

Safety and Capacity Analysis of Automated and Manual Highway Systems

Carbaugh, Jason
Godbole, Datta N.
Sengupta, Raja
1999

This paper compares safety of automated and manual highway systems with respect to result- ing rear-end collision frequency and severity. The results show that automated driving is safer than the most alert manual drivers, at similar speeds and capacities. We also present a detailed safety-capacity tradeo study for four di erent Automated Highway System concepts that di er in their information structure and separation policy.

Engaging the International Community: Research on Intelligent Transportation Systems (ITS) Applications to Improve Environmental Performance

Shladover, Steven
Barth, Matthew J
Zhang, Wei-Bin
2011

This project was proposed to build on the exposure that the authors of this report have had during the past two years to the thinking of the Japanese and European thought leaders about how Intelligent Transportation System (ITS) can contribute toward meeting environmental goals, especially for reducing CO2.

HOT Lane Simulation Tools

Horowitz, Roberto
Kurzhanskiy, Alex A.
Wright, Mathew
2018

This report describes the simulation model and software for freeway corridors with High-Occupancy Vehicle (HOV) and High-Occupancy or Tolled (HOT) lanes, and the model calibration methodology.

Grade Crossing/Traffic Signal Optimization Study

We, Guoyuan
Li, Irene
Zhang, Wei-Bin
Johnston, Scott
Li, Meng
Zhou, Kun
2010

The second phase of this project further investigates impacts to local traffic operations at intersections adjacent to signal preemption by SPRINTER commuter trains and comes up with countermeasures that not only minimize such impacts but also take into account the traffic signal coordination. An extended traffic signal optimization model has been developed to minimize overall traffic delays and the weighted width of “green band” along several coordinated traffic signals around the grade crossings. Based on the train’s movement detection at grade crossings and the waiting queue estimation...

Safe Operation of Automated Vehicles in Intersections

Germbek, Offer
Kurzhanskiy, Alex A.
Medury, Aditya
Varaiya, Pravin
Yu, Mengqiao
Siddiqui, Asfand
2018

This report describes the technology needed for safe and efficient operation of signalized intersections in the presence of automated vehicles (AVs).

The ISTEA/ITS Connection In California: The State Of The Relationship And Opportunities For Productive And Beneficial Linkages

Miller, Mark
Jia, Wenyu
1998

This report describes research which had three objectives: 1) investigate the current state of California's implementation of the Intermodal Surface Transportation Efficiency Act (ISTEA) with respect to Intelligent Transportation Systems (ITS), 2) assess the extent to which ITS has been integrated within the State's transportation planning process, and 3) recommend opportunities for linkages between ISTEA and ITS that have not yet been recognized. A literature search was first conduced which studied the key features of ISTEA, specific ITS-related issues, the institutional environment, and...

Transit Integrated Collision Warning System Volume II: Field Evaluation

Chan, Joanne
Dicky, Susan
Duncil, Bart
Johnston, Scott
Kretz, Paul
Lian, Thang
Lu, Xiaoyun
Marco, David
Nelson, David
Shladover, Steven
Zhang, Wei-Bin
Zhang, Yongquan
Duggins, Dave
Gowdy, Jay
Hebert, Martial
Kozar, John
MacLachlan, Rob
Metz, Christoph
Steinfeld, Aaron
Suppe, rne J
Thorpe, Chuck
Burton, Frank
DeBone, Dan
Snyder, Rick
2007

This evaluation report examines the performance of the Integrated Collision Warning System prototype developed by the University of California PATH Program and the Carnegie Mellon University Robotics Institute. The evaluation was based on testing the sensors, processing algorithms, and driver-vehicle interfaces in both controlled and real world operational environments. Evaluation metrics and methodologies were used to evaluate the effectiveness of the system. The effort for this evaluation was based on the following tasks:Task 1: Develop Evaluation ScenariosTask 2. Perform Closed Course...