ITS Berkeley

A Variable Formulation of Kinematic Waves: Solution Methods

Daganzo, Carlos F.
2003

This paper presents improved solution methods for kinematic wave trafficc problems with concave flow-density relations. As explained in part I of this work, the solution of a kinematic wave problem is a set of continuum least-cost paths in space-time. The least cost to reach a point is the vehicle number. The idea here consists in overlaying a dense but discrete network with appropriate costs in the solution region and then using a shortest-path algorithm to estimate vehicle numbers. With properly designed networks, this procedure is more accurate than existing methods and can be applied...

Transportation Models In the Policy-Making Process: Uses, Misuses, And Lessons For The Future

Brinkman, Anthony
Goldman, Todd
1998

Panel 1. This session set the stage for the conference by examining some of the overarching issues in transportation modeling. Martin Wachs spoke about the promise and limitation of models from an ethical frame of reference. Genevieve Giuliano followed with an examination of how some of the changes underway in society may limit the ability to produce useful transportation forecasts. Finally, Larry Dahms commented from the perspective of an agency that operates within the policy-making process. Panel 2. The aim of this session was to generate a discussion of ways to make better use of...

2001: An Airspace Odyssey SUMMARY PROCEEDINGS OF THE 2001 AIRPORT NOISE SYMPOSIUM AND AIRPORT AIR QUALITY SYMPOSIUM

Gosling, Geoffrey D.
2001

These proceedings summarize the presentations made at the 16th Airport Noise Symposium and 2nd Airport Air Quality Symposium, organized by the Technology Transfer Program of the Institute of Transportation Studies (ITS) and held in San Diego, California, from February 25 to March 2, 2001. The presentation slides for many of the presentations at both symposia are available on the ITS Technology Transfer Program website at. The symposia were organized in conjunction with the National Center of Excellence for Aviation Operations Research, the Federal Aviation Administration, the Federal...

Proceedings of the Institute of Transportation 50th Birthday Symposium April 23-24, 1998 The Transportation Enterprise: Challenges of ther 21st Century

Bertini, Robert L.
Orrick, Phyllis
1998

This report is a summary of proceedings from a two-day symposium convened by the Institute of Transportation Studies at the University of California at Berkeley in April 1998 to commemorate the fiftieth birthday of the Institute and to lay the groundwork for the Institute’s second fifty years. With the title, The Transportation Enterprise: Challenges of the 21st Century, the Symposium set out to generate thoughtful, active discussion in preparation for laying out an action plan for the Institute in the21stCentury.

Public Transit and Shared Mobility COVID-19 Recovery: Policy Options and Research Needs

Shaheen, Susan, PhD
Wong, Stephen, PhD
2020

While the COVID-19 crisis has devastated many public transit and shared mobility services, it has also exposed underlying issues in how these services are provided to society. As ridership drops and revenues decline, many public and private providers may respond by cutting service or reducing vehicle maintenance to save costs. As a result, those who depend on public transit and shared mobility services, particularly those without access to private automobiles, will experience further loss of their mobility. These transportation shifts will be further influenced by changing work-from-home...

The General Transit Feed Specification Makes Trip-Planning Easier — Especially During a Pandemic — Yet its Use by California Agencies is Uneven

Frick, Karen Trapenberg, PhD
Kumar, Tanu, PhD
Li, Ruyin
Patil, Atharva
Post, Alison, PhD
2020

Developed in 2005, the General Transit Feed Specification (GTFS) is making transit trip planning easier by allowing public transportation agencies to share transit schedules in an electronic format that can be used by a variety of trip-planning applications, such as Google Maps. The GTFS can be used to share static transit schedules (GTFS-s) or provide real-time information on transit vehicle arrivals and departures (GTFS-r). Providing real-time updates has proven to be exceptionally valuable during the COVID-19 pandemic. For example, between January 13th and April 25th of this year Apple...

Intelligent Transportation Systems and Infrastructure: A Series of Briefs for Smart Investments

ITS Berkeley
2017

Intelligent transportation systems and technology provide a high return on investment, especially when incorporated as part of ongoing construction activities. Efficient operation and maintenance of our transportation infrastructure requires real time data exchange provided by ITS (Intelligent Transportation System) technology. The cost to acquire and install this technology is roughly 5% of the overall construction budget if installed during construction. The ROI (measured in safety, travel time reliability, throughput and quality of life) takes less than 6 months in highly congested...

How Might Adjustments to Public Transit Operations Affect COVID-19 Transmission?

Huan, Yiduo, MSc
Shen, Zuojun Max, PhD
2022

During the COVID-19 pandemic, public transportation systems worldwide faced many challenges, including significant loss of ridership. Public agencies implemented various COVID-19-related policies to reduce transmission, such as reducing service frequency and network coverage of public transportation. Recent studies have examined the effectiveness of these policies but reach different conclusions due to varying assumptions about how passengers may react to service changes. Some studies proposed optimizing public transit operation timetables, service frequency, and network coverage to reduce...

Toll Pricing “Futures” Market Could Reduce Congestion and Increase Revenue

Fournier, Nicholas, PhD
Patire, Anthony, PhD
Skabardonis, Alexander
2024

Transportation agencies are increasingly relying on tolls to raise revenue and to mitigate congestion, but conventional fixed tolls do not necessarily encourage offpeak use of infrastructure, and high tolls can dampen economic productivity. Dynamically adjusting pricing based on demand can incentivize travelers to avoid peak traffic periods and shift it to other modes, but given the unpredictable nature of traffic, travelers lack the information necessary to accurately predict congestion, so dynamic pricing has minimal effect on demand. Dynamic toll pricing also poses equity concerns for...

Dashboard Cameras Combined with AI Provide an Affordable Method for Identifying Curb Usage

Arcak, Murat
Kurzhanskiy, Alexander
2024

The increasing reliance on transportation network companies (TNCs) and delivery services has transformed the use of curb space. The curb space is also an important interface for bikeways, bus lanes, street vendors, and paratransit stops for passengers with disabilities. These various demands are contributing to a lack of parking, resulting in illegal and double-parking and excessive cruising for spaces and causing traffic disturbance, congestion, and hazardous situations. How cities manage this public asset to support safety and the local economy relies on first understanding the usage...