Travel Behavior

Mission and Mix: A Study of the Changing Tasks and Staffing Requirements the California Department of Transportation

Jones, David W.
Taylor, Brian D.
1987

This study examines the organizational capabilities and staff skills that will be needed to execute the changing mission of the . California Department of Transportation (Caltrans). It is an engineering development study in the sense that it is concerned with the professional know-how that Caltrans will need in the future. It is, at the same time, a strategic planning study in the sense that strategic planning is the art of positioning organizations to both meet and make change.

Women and Cycling: A Case Study of the Use of San Francisco Bike Lanes

Deakin, Elizabeth
Bhamidi, Vidya
Funaki, Dorry
Colani, Tasha
2018

This paper presents a case study of the use of San Francisco bike lanes with a focus on women. Bike counts and intercept surveys of cyclists at three locations in San Francisco’s SoMa District were complemented by focus groups with cyclists, particularly women cyclists, and brief interviews with non-cyclists. Consistent with other US studies, we find that white men are disproportionately represented among the cyclists we observed, and that women bike less and bike shorter distances. However, at least in the SoMa sample, women are more likely to bike to work than men. Cyclists included...

Low-Income Student Bus Pass Pilot Project Evaluation: Final Report

McDonald, Noreen
Librera, Sally
Deakin, Elizabeth
Wachs, Martin
2003

In August 2002, AC Transit began offering free bus passes to low-income middle and high school students. At the same time, the agency reduced the cost of its monthly youth pass from $27 to $15. This dramatic reduction in costs for student riders resulted from a grassroots advocacy campaign that successfully focused local political attention on school transportation in an area where school busing had largely been eliminated for middle school and high school students. The creation of the program drew together state and local elected officials, youth advocates, schools, and transportation...

Matroid Intersection and its application to a Multiple Depot, Multiple TSP

Rathinam, Sivakumar
Sengupta, Raja
2006

This paper extends the Held-Karp’s lower bound available for a single Travelling Salesman Problem to the following symmetric Multiple Depot, Multiple Travelling Salesman Problem (MDMTSP): Given k salesman that start at different depts, k terminals and n destinations, the problem is to choose paths for each of the salesmen so that (1) each vehicle starts at its respective depot, visits atleast one destination and reaches any one of the terminals not visited by other vehicles, (2) each destination is visited by exactly one vehicle and (3) the cost of the paths is a minimum among all possible...

Transit-Based Smart Parking in the San Francisco Bay Area: an Assessment of User Demand and Behavioral Effects

Rodier, Caroline J.
Shaheen, Susan A.
Eaken, Amanda M.
2004

This paper presents early findings from an application of advanced parking technologies to increase effective parking capacity at a transit station during the first half of 2004 in the San Francisco Bay Area (CA). It begins with an extensive review of the literature related to transit-based smart parking management systems to illustrate the range of system configurations and their potential travel, economic, and environmental effects. Two important conclusions from this review are: (1) lack of parking spaces at transit stations may be a significant constraint to transit use and (2) pre-...

Research Synthesis for the California Zero Traffic Fatalities Task Force

Grembek, Offer, PhD
Chen, Katherine
Taylor, Brian D., PhD
Hwang, Yu Hong
Fitch, Dillon, PhD
Anthoine, Sonia
Chen, Bingchu
Grover, Salvador
2020

This research synthesis consists of a set of white papers that jointly provide a review of research on the current practicefor setting speed limits and future opportunities to improve roadway safety. This synthesis was developed to inform thework of the Zero Traffic Fatalities Task Force, which was formed in 2019 by the California State Transportation Agencyin response to California Assembly Bill 2363 (Friedman). The statutory goal of the Task Force is to develop a structured,coordinated process for early engagement of all parties to develop policies to reduce traffic fatalities to zero....

Lower and Upper Bounds for a Symmetric Multiple Depot, Multiple Travelling Salesman Problem

Rathinam, Sivakumar
Sengupta, Raja
2006

This paper extends the well known Held-Karp's lower bound available for a single Travelling Salesman Problem to the multiple depot case. The LP-relaxation of a symmetric multiple vehicle, multiple depot problem is shown to be lower bounded by an infinite family of bounds. Each lower bound can be computed in a tractable way using a matroid intersection algorithm. When the costs of travelling between any two locations satisfy triangle inequality, it is shown that there exists a 2-approximation algorithm for solving the multiple depot, multiple TSP. These results are useful in solving the...

Assessing the Variation of Curbside Safety at the City Block Level

Medury, Aditya, PhD
Vlachogiannis, Dimitris;
Grembek, Offer, PhD
2020

Investigating the dynamics behind the likelihood of vehicle crashes has been a focal research point in the transportationsafety field for many years. However, the abundance of data in today's world generates opportunities for deepercomprehension of the various parameters affecting crash frequency. This study incorporates data from many differentsources including geocoded police-reported crash data, curbside infrastructure data and socio-demographic data for thecity of San Francisco, CA. Findings revealed that the GFMNB model provides a better statistical fit than the FMNB andNB model in...

Impacts of California's Graduated Licensing Law of 1998: An assessment by the Institute of Transportation Studies at UC Berkeley of the effects of the law on fatal and injury crashes of 16 year-old drivers

Cooper, Douglas
Gillen, David
Atkins, Frank
2004

In July 1998 California changed its graduated driver licensing laws (GDL) for new drivers under the age of 18 to include restrictions on hours of driving, carrying teen-age passengers, and requiring more adult supervised driving practice. With fatal and injury crash data from California's Statewide Integrated Traffic Records System, this study, sponsored by the California State Automobile Association, used standard regression analysis as well as the Bai-Perron stochastic multiple structural break model to determine the effect of the law on teen-age passengers and crash rates of 16 year-old...

To Pool or Not to Pool? Understanding the Time and Price Tradeoffs of OnDemand Ride Users – Opportunities, Challenges, and Social Equity Considerations for Policies to Promote Shared-Ride Services

Shaheen, Susan, PhD
Lazarus, Jessica
Caicedo, Juan
Bayen, Alexandre, PhD
2021

On-demand mobility services including transportation network companies (also known as ridesourcing and ridehailing) like Lyft and Uber are changing the way that people travel by providing dynamic mobility that can supplement public transit and personal-vehicle use. However, TNC services have been found to contribute to increasing vehicle mileage, traffic congestion, and greenhouse gas emissions. Pooling rides ⎯ sharing a vehicle by multiple passengers to complete journeys of similar origin and destination ⎯ can increase the average vehicle occupancy of TNC trips and thus mitigate some of...