Bicycling

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...

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

AbstractLarge-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 (city or county) where bicycle count and. Practical ApplicationsAgencies 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.

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.

A Data Science Framework for Planning the Growth of Bicycle Infrastructures

Olmos, Luis E.
Tadeo, Maria Sol
Vlachogiannis, Dimitris
Alhasoun, Fahad
Espinet Alegre, Xavier
Ochoa, Catalina
Targa, Felipe
Marta Gonzalez
2020

Cities around the world are turning to non-motorized transport alternatives to help solve congestion and pollution issues. This paradigm shift demands on new infrastructure that serves and boosts local cycling rates. This creates the need for novel data sources, tools, and methods that allow us to identify and prioritize locations where to intervene via properly planned cycling infrastructure. Here, we define potential demand as the total trips of the population that could be supported by bicycle paths. To that end, we use information from a phone-based travel demand and the trip distance...

Why Do Building Owners Invest in Bicycle-Oriented Design?

Orrick, Phyllis
Karen Trapenberg Frick
Ragland, David R.

We found that broader government policies such as infill zoning exemptions and energy-saving directives made BOD more feasible. A comprehensive survey of existing BOD requirements, guidelines, and best practices of BOD design elements would be useful to policymakers, local officials, and developers as they confront decisions on how or if to encourage BOD. More broadly, additional research on the potential relationship between BOD and mode choice of building tenants could lead to a greater understanding of what benefits are derived from these investments as well as constraints. Finally, an...

Bicycle Infrastructure that Extends Beyond the Door: Examining Investments in Bicycle-Oriented Design Through a Qualitative Survey of Commercial Building Owners and Tenants

Orrick, Phyllis
Karen Trapenberg Frick
Ragland, David R
2011

This paper presents the results of a qualitative survey of commercial owners, managers, and occupants in the City of Berkeley who have invested in on-site bicycle facilities such as secure parking, showers, changing rooms, and clothing lockers, what we are calling “bicycle-oriented design” (BOD). The sites represent a selection of building types common in the commercial building stock in U.S. cities.The research is designed to answer three questions about the use of BOD: (1) what were motivations behind the decision to invest in BOD (2) what are the challenges and rewards for investing in...

Bicycle Infrastructure that Extends Beyond the Door: Examining Investments in Bicycle-Oriented Design Through a Qualitative Survey of Commercial Building Owners and Tenants

Orrick, Phyllis
Karen Trapenberg Frick
Ragland, David R.
2011

This paper presents the results of a qualitative survey of commercial owners, managers, and occupants in the City of Berkeley who have invested in on-site bicycle facilities such as secure parking, showers, changing rooms, and clothing lockers, what we are calling “bicycle-oriented design” (BOD). The sites represent a selection of building types common in the commercial building stock in U.S. cities.The research is designed to answer three questions about the use of BOD: (1) what were motivations behind the decision to invest in BOD (2) what are the challenges and rewards for investing in...

Airports and Bicycles: What Are Obstacles to and Incentives for Improving Bicycle Access?

Orrick, Phyllis
Karen Trapenberg Frick
2012

Case studies examined how airport operators addressed bicycle access to their properties and the motivations and obstacles that they faced in light of new policies to integrate bicycles, along with transit and walking, into transportation planning, design, and construction and to increase the bicycle's role in the transportation system. Eight influential elements that emerged from the review of policy documents and research literature were used to guide interviews: governance structure, location, access roads, self-perceived environmental stewardship, spending restrictions on nonaviation...