E-Bikes

Bicycle Level of Service: Proposed Updated Pavement Quality Index

Huang, Jiayun
Fournier, Nicholas
Alexander Skabardonis
Transportation Research Record: Journal of the Transportation Research Board
2021

The Highway Capacity Manual (HCM) employs a simple five-point system to assess the quality of bikeway pavement as part of the comprehensive bicycle level of service (LOS) evaluation. Unfortunately, the ambiguous and rudimentary nature of the existing HCM Pavement Quality Index (PQI) fails to offer an objective review of bikeways across different jurisdictions. In the following analysis, first is an assessment of the PQI and bicycle LOS in the HCM. To demonstrate the impact of the pavement quality rating and the importance of a more standardized evaluation method, a sensitivity analysis is...

Improved Analysis Methodologies and Strategies for Complete Streets

Fournier, Nicholas
Huang, Amy
Alexander Skabardonis
University of California, Berkeley
California Department of Transportation
California Business Transportation
Federal Highway Administration
2021

Complete streets movement is a national effort to return to traditional streets in cities to enhance livability, safely, accommodate all modes of travel, provide travel choices, ease traffic congestion, and promote healthier communities. The California Department of Transportation (Caltrans) and several local agencies in the State have developed implementation plans for complete streets. In this project, the authors developed and tested improved strategies and analysis methodologies for complete streets, taking into consideration the emerging advances in technology on control devices and...

Evaluation of a Novel Methodology to Measure Bicycle Network Connectivity

Miah, Md Mintu
Fournier, Nicholas
Alexander Skabardonis
2025

Bicycling is among the most environmentally sustainable and economically affordable travel modes available. The popularity of bicycling activities strongly depends on the availability of well-connected bicycle networks. Existing methodologies to measure network connectivity are often purely academic, complex, subjective, or locally specific. This study aims to develop and test a reliable methodology for evaluating bicycle network connectivity. The study proposed two weighted shortest-path graph algorithms: the low-stress bike network connectivity (LSBNC), and designated bicycle network...

Evaluate the Causes of Pedestrian and Bicyclist Traffic Fatalities and Injuries, and Establish Appropriate Countermeasures for Use in California

Arnold, Lindsay S.
Ragland, David R.
Yip, Harry
Cooper, Doug
MacLeod, Kara
Hennessey, Daniel
Mitman, Meghan
DuBose, Brooke
2010

The three primary objectives of this project were to: (1) conduct research on existing bicycle and pedestrian safety programs and guidelines in the U.S. and internationally, (2) obtain and analyze existing data related to pedestrian and bicycle safety in California, and (3) assist in developing methodologies for producing safety action plans, identifying and selecting projects, conducting education campaigns, and targeting enforcement campaigns. To meet these objectives, SafeTREC developed a set of resources and tools for use in California. These resources make information and data on...

The Analysis of Right-of-Way for Different Road Users in China: Passing-Passenger-Unit Versus Passenger-Car-Unit

Xiong, Wen, Professor
Zhang, Yuanyuan, PhD
Chen, Xiaohong, Professor
Jiang, Chao
2014

Being a public resource, the roadway space was distributed between different road users based on the Passenger-Car-Unit (PCU) concept. However, this concept tends to under estimate the capacity of public transportation and non-motorized travel. To improve the traditional car-oriented design to become more human-oriented, this study proposed a Passing-passenger-unit (PPU) and the method to observe the PPU in roadway level and area level. The PPU data were collected for urban arterials and residential areas in China to test the method and to compare the right-of-way distribution at different...

Safe Routes to School Local School Project: A Health Evaluation at 10 Low-Income Schools

Cooper, Jill F., MSW
McMillan, Tracy PhD
2010

Routes to School National Partnership (Partnership) founded the Local School Project (Project) in 2008 to assist ten schools in lowincome communities to: 1) develop and evaluate a school-based SRTS program, 2) build local capacity to apply for state or federal SRTS funding, and 3) increase safe walking and bicycling to and from the school and in the community. The Centers for Disease Control and Prevention, Kaiser Permanente, and the Robert Wood Johnson Foundation provided funding for the Project.This report presents the results, lessons learned and recommendations identified during the...

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-...

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...

Bicycle Detection and Operational Concept at Signalized Intersections Phase 2

Shladover, Steven E.
Kim, ZuWhan
Cao, Meng
Sharafsaleh, Ashkan
Li, Irene
Johnston, Scott
1997

This study reports on a method to accomplish sensor validation and fusion in Intelligent Transportation Systems (ITS). The method is based on probabilistic and fuzzy techniques that express a confidence in the sensor data and take into account environmental factors and the state of the system. Sensor data fusion uses the confidence assigned to each sensor reading and integrates them into one reading. Noise and failure are filtered from the data and lead to a safety improvement in ITS.

Transit Oriented Development and Commercial Gentrification: Exploring the Linkages

Chapple, Karen
Loukaitou-Sideris, Anastasia
Gonzalez, Silvia R.
Kadin, Dov
Poirer, Joseph
2018

As central cities in California continue their renaissance, commercial gentrification is often identified by residents as a concern. For many, commercial gentrification means the intrusion of new businesses that force out a favorite food shop or a longstanding retail store because of higher rents. For others, it means an influx of hip cafés, trendy retail boutiques, and gourmet fast food restaurants - places that change the fabric of their familiar neighborhood, for better or for worse. For many merchants, commercial gentrification can have implications for economic survival, as increased...