E-Bikes

A Zoox and an e-bike collided in S.F. Here’s what it says about robotaxi safety

May 13, 2025

San Francisco Chronicle Scott Moura, Faculty Director of Partners for Advanced Transportation Technology (PATH) and Professor of Civil and Environmental Engineering, alongside Matt Raifman SafeTREC researcher, and Steven Shadover PATH researcher discuss A Zoox and an e-...

To Pool or Not to Pool? Understanding Opportunities, Challenges, and Equity Considerations to Expanding the Market for Pooling

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

On-demand mobility services such as bikesharing, scooter sharing, and transportation network companies (TNCs, also known as ridesourcing and ridehailing) are changing the way that people travel by providing dynamic, on-demand mobility that can supplement public transit and personal-vehicle use. Adoption of on-demand mobility has soared across the United States and abroad, driven by the flexibility and affordability that these services offer, particularly in urban areas where population density and land use patterns facilitate a reliable balance of supply and demand. The growth of app-based...

Improving Bay Area Rapid Transit (BART) District Connectivity and Access with the Segway Human Transporter and Other Low Speed Mobility Devices

Rodier, Caroline J.
Shaheen, Susan A.
Novick, Linda
2004

Access to transit stations is a significant barrier to transit use in many urban regions. Parking during peak hours is often limited, and many individuals are only willing to walk about a quarter mile to transit stations (Cervero, 2001). While there are some effective feeder services (e.g., shuttles) that help extend the range of transit access, these systems are limited because of fixed routes and schedules. A number of strategies have recently been implemented to improve transit access and transit use, including bicycles, electric bicycles, carsharing, and personal neighborhood electric...

Optimal Design of Transit Networks Fed by Shared Bikes

Wu, Liyu
Gu, Weihua
Fan, Wenbo
Cassidy, Michael J.
2020

Transit systems are designed in which access and egress can occur via a shared-bike service. Patrons may walk to shared-bike docking stations nearest their origins, and then cycle to their nearest transit stations where they deposit the bikes. The travel pattern is reversed when patrons cycle from their final transit stations on to their destinations. Patrons choose between this option and that of solely walking to or from transit stations. Shared bikes are priced to achieve the system-optimal assignment of the two feeder options. Transit trunk-line networks are laid-out in hybrid fashion...

The Relationship Between Non-Motorized Mode Choice and the Local Physical Environment

Rodrı́guez, DA
Joo, J
2004

By estimating multinomial choice models, this paper examines the relationship between travel mode choice and attributes of the local physical environment such as topography, sidewalk availability, residential density, and the presence of walking and cycling paths. Data for student and staff commuters to the University of North Carolina in Chapel Hill are used to illustrate the relationship between mode choice and the objectively measured environmental attributes, while accounting for typical modal characteristics such as travel time, access time, and out-of-pocket cost. Results...

The North Carolina Physical Activity Policy Research Center: Making Connections with North Carolina Planners

Evenson, KR
Fesperman, C
Aytur, S
Brown, A
Rodriguez, DA
Salveson, D
2006

Physical activity participation for youth and adults is suboptimal in North Carolina. There is growing interest among policy makers to promote physical activity, yet research in this area is limited. The North Carolina Physical Activity Policy Research Center was established in 2004 to conduct research on physical activity and policy. This cross-disciplinary center brings together faculty and researchers from the University of North Carolina School of Public Health and the College of Arts and Sciences. Current projects include understanding and documenting polices that affect walking...

Development of Pedestrian & Bicycle Transportation Course Modules.

Rodriguez, D
Turochy, R
Sundstrom, C
Sandt, L
2014
According to a 2012 report by the Alliance for Biking and Walking, crashes involving bicyclists and/or pedestrians account for almost 15% of all traffic crashes. The states that house STRIDE consortium universities, including Florida, Alabama, Georgia, North Carolina, and Mississippi, are among the top seven states with the highest pedestrian and bicyclist fatality rates in the nation. Training the next generation of planners and engineers to consider pedestrian and ...

Bicycle Safety in Bogotá: A Seven-Year Analysis of Bicyclists’ Collisions and Fatalities

Carvajal, G
Sarmiento, OL
Medaglia, A
Cabrales, S
Rodríguez, D
Quintsberg, A
Lopez, S
2020
Road safety research in low- and middle-income countries is limited, even though ninety percent of global road traffic fatalities are concentrated in these locations. In Colombia, road traffic injuries are the second leading source of mortality by external causes and constitute a significant public health concern in the city of Bogotá. Bogotá is among the top 10 most bike-friendly cities in the world. However, bicyclists are one of the most vulnerable road-users in the city. Therefore, assessing the pattern of mortality and understanding the variables affecting the outcome of bicyclists’...

STC Matching Grant Annual Report

Rodriguez, DA
2008

While the conventional approach to safety planning has emphasized crash analysis with police-reported crash information, transportation professionals increasingly recognize the importance of identifying potential crash risk and considering environmental characteristics. In this proactive approach, individuals’ perception of crash risk provides important information in identifying potential crash risk. As built environment characteristics such as the presence of crosswalks, sidewalks, and number of lanes, are expected to influence the levels of pedestrian and bicycle safety, this study...

The Built Environment and Health: Impacts of Pedestrian-Friendly Designs on Air Pollution Exposure

Nazelle, A De
Rodriguez, DA
Crawford-Brown, D
2009

In the wake of the growing popularity of pedestrian-oriented community designs, it is timely to assess potential risk trade-offs of such urban planning strategies. Pedestrian-friendly designs are currently being called for and implemented in the US to tackle in particular problems associated with insufficient physical activity in the population. Unintended consequences may emerge, however, especially due to potential increases in the inhalation of pollutants as the population walking or cycling in polluted environments increases. A risk assessment of such built environment...