Bicycling

UAV Scheduling Strategies in Multi-modal Last-Mile Urban Parcel Delivery

Li, Ang
Mark Hansen
Zou, Bo
2023

Urban parcel delivery has emerged as a high growth market, and the resulting delivery traffic can pose great challenges in dense urban areas. There is growing interest in supplanting the conventional model of a dedicated delivery person operating a van to alternatives featuring new classes of vehicles such as drones, autonomous ground vehicles, cargo bikes and non-motorized vehicles. This work proposes combined delivery strategies using trucks, cargo bikes and drones. We develop and compare multi-modal delivery strategies with various mode combinations. We work on zone-based multi-modal...

Pilot Models for Estimating Bicycle Intersection Volumes

Julia Griswold
Medury, Aditya
Schneider, Robert J.
2011

Bicycle volume data are useful to practitioners and researchers to understand safety, travel behavior, and development impacts. This paper describes the methodology used to develop several simple models of bicycle intersection volumes in Alameda County, California. The models are based on two-hour bicycle counts performed at a sample of 81 intersections in the Spring of 2008 and 2009. Study sites represented areas with a wide range of population density, employment density, proximity to commercial property, neighborhood income, and street network characteristics. The explanatory variables...

Old Road, New Directions: Plan for Adeline Street in Berkeley, California

Julia Griswold
Malinoff, Aaron
Karen Trapenberg Frick
Deakin, Elizabeth
2011

This paper presents a plan for transforming a major arterial and a transit station that divide a low-income business and residential district into an economically healthy, context-sensitive, transit-oriented development. Adeline Street is a major point of entry into Berkeley, California, linking the city of Oakland on the south to the central districts of Berkeley. Formerly a major streetcar corridor, Adeline is now the location of a Bay Area Rapid Transit (BART) station and a surface parking lot, for which housing and businesses were removed in the 1960s. The street's 180-ft right-of-way...

A Behavioral Modeling Approach to Bicycle Level of Service

Julia Griswold
Yu, Mengqiao
Filingeri, Victoria
Grembek, Offer
Joan Walker
2018

Bicycle level of service (LOS) measures are essential tools for transportation agencies to monitor and prioritize improvements to infrastructure for cyclists. While it is apparent that different types of cyclists have varying preferences for the facilities on which they ride, in current research and practice, measures are used that are either insufficiently quantitative and empirical or lack cyclist segmentation. In this study, we conducted a detailed survey on cyclist habits, preferences, and user experience, capturing responses to videos of a bicycle traveling on road segments in the San...

Performance Measures for Bicycle Suitability on the State Highway System

Julia Griswold
Yu, Mengqiao
Kendrick, Vicotria
Zhang, Yuanyuan
Sanz, Natalia
Grembek, Offer
Joan Walker
2016

Caltrans is considering performance measures that can be used to evaluate the quality of the bicycling experience on the state highway system. The purpose of this research is to recommend the best methodology to use in California as a quantitative measurement for how well the roads support bicycling. We identified two widely used performance measures, Highway Capacity Manual bicycle level of service and level of traffic stress, for evaluation, and developed time cost estimates for applying the measures to the state highway system. In addition, we performed a pilot study to test a proof of...

Pedestrian Count Expansion Methods: Bridging the Gap between Land Use Groups and Empirical Clusters

Medury, Aditya
Julia Griswold
Huang, Louis
Grembek, Offer
2019

Count expansion methods are a useful tool for creating long-term pedestrian or cyclist volume estimates from short-term counts for safety analysis or planning purposes. Expansion factors can be developed based on the trends from automated counters set up for long periods of time. Evidence has shown that the activity patterns can vary between sites so that there is potential to create more accurate estimates by grouping similar long-term count trends into factor groups. There are two common approaches to developing factor groups in pedestrian and cyclist count expansion studies. The land...

Development of Crash Reduction Factors for Bicycle-Related Safety Countermeasures

Grembeck, Offer
Julia Griswold
University of California, Berkeley
University of North Carolina at Chapel Hill. Highway Safety Research Center
2019

Developing quality California-specific crash modification factors (CMFs) for bicycle-related safety countermeasures will support practitioners in making more informed decisions about infrastructure improvement projects. The researchers identified a comprehensive list of countermeasures, identified existing CMFs and reviewed their quality and applicability to California, determined key bicycle injury and fatality crash patterns in the state, prioritized potential bicycle safety countermeasures for study, and identified potential study sites. The results show there is limited availability of...

Evaluate the Safety Effects of Adopting a Stop-as-Yield Law for Cyclists in California

Mahdinia, Iman
Julia Griswold
Unda, Rafael
Sohrabi, Soheil
Grembek, Offer
2024

The escalating number of injuries and fatalities among cyclists is a pressing safety concern. In the United States, communities are actively seeking strategies to boost cyclist safety, with some states implementing bike-specific policies, such as stop-as-yield laws, to support cyclists. Stop-as-yield laws allow cyclists to treat stop signs as yield signs. The laws are not yet widely implemented, and their potential safety impact is a subject of debate among transportation experts and advocates. This study investigates how stop-as-yield laws can positively or negatively affect safety and...

Creating an Inclusive Bicycle Level of Service: Virtual Bicycle Simulator Study

Julia Griswold
Aguilar, Edna
Wang, Han
Miah, Md Mintu
2025

Bicycle level of service (BLOS) is an essential performance measure for transportation agencies to monitor and prioritize improvements to infrastructure, but existing measures do not capture the nuance of facility differences on the state highway system. However, with the advancements in virtual reality (VR) technology, a VR bicycle simulator is an ideal tool to safely gather user feedback on a variety of bicycling environments and conditions. This research explored the benefits and limitations of using a VR environment to assess individuals’ bike infrastructure preferences. We conducted a...

Methodology of Large-Scale Annual Average Daily Bicycle Traffic Estimation

Miah, Md Mintu
Julia Griswold
Proulx, Frank
Bigham, John
Banerjee, Ipsita
Grembek, Offer
2025

Abstract Large-scale bicycle network design, safety, and crash estimates largely depend on network-wide bicycling volume estimation. Previous studies developed direct demand models on a smaller scale (e.g. city or county) where bicycle count and ...Practical Applications Agencies often need to estimate bicycle volumes at the link level across entire networks for planning, safety, and design purposes. This study uses expansion factors to introduce a method for converting short-term site volume data.