Data collection

Street Story: How can we create inclusive community engagement technologies?

November 1, 2018

During the California-wide PedsCount! Summit 2018, we launched Street Story, SafeTREC’s new community engagement platform that allows residents, community groups and agencies to collect information about transportation collisions, near-misses, general hazards and safe locations to travel. In essence, the platform invites users to enter ...

March 15: Using Crowdsourced Data Strategies in Community Engagement

February 28, 2022

Community members at a walking and biking safety training filling out a Street Story survey about their transportation safety experiences, with the title of the Peer Exchange session on 3 stacked color boxes in orange, yellow and blue

UC Berkeley Safe Transportation Research and Education Center (SafeTREC) and California Walks are...

SafeTREC Co-Directors David Ragland & Offer Grembek present at ATSIP 2021 Virtual Traffic Records Forum

September 14, 2021
SafeTREC's Ragland and Grembek present at 2021 ATSIP Traffic Records Forum ATSIP Traffic Record Forum 2021

This year the Association of Transportation Safety Information Professionals (ATSIP) held their annual Traffic Records Forum virtually from August 16-20, 2021 to convene data analysts, state and local law enforcement officials, engineers, motor vehicle officials, emergency...

“Office Hour” with the Street Story Team

July 27, 2022
Do you have questions about how to enter Street Story data, analyze data from your community, create a custom boundary - or other questions about using the tool? How about using the paper version or simply entering reports?

Screenshot of the StreetStory website

Join the UC Berkeley ...

Investigating Bicyclists' Perception of Comfort on Physically Separated Bicycle Paths in Nanjing, China

Li, Zhibin
Wang, Wei
Liu, Pan
Schneider, Robert J.
Ragland, David R.

Providing bicyclists favorable and comfortable riding environments is an important objective for transportation professionals. This study investigated the factors that contribute to bicyclists' perception of comfort on physically separated bicycle paths and quantified their impacts. A survey was conducted on 29 physically separated bicycle paths in the metropolitan area of Nanjing, China. A factor analysis and an ordered probit model were used to analyze the data. The results showed that the mean perception of comfort was significantly different between age groups, but not...

Consequences of Driving Reduction or Cessation for Older Adults

Harrison, Ayodele
Ragland, David R.

The purpose of this study was to understand the adverse consequences of driving reduction or cessation among elderly adults. A comprehensive literature search was conducted for studies that (a) included information on driving by an elderly population, (b) included results from a qualitative or quantitative (or both) study of the elderly and driving cessation, and (c) provided information to evaluate consequences surrounding driving reduction or cessation. The selected subjects of the studies included men...

9/22/21 Webinar - Safety on Our Streets: Traffic Safety in San José

August 31, 2021
Focus Cities Webinar: Safety on Our Streets: Traffic Safety in San José

World Day of Remembrance memorial event in San Jose, CA to honor loved ones lost to traffic violence.

The recording of the September 21, 2021 Focus City Webinar: Safety on Our Streets can be found at the ...

Design of Alert Criteria for an Intersection Decision Support System

Shladover, Steven E.
Vanderwerf, Joel
Ragland, David R.
Chan, Chin-Yao

This paper describes the design and preliminary evaluation of the criteria for alerting drivers to a specific set of intersection hazards. The research is being conducted as part of the development of an intersection decision support (IDS) system that uses the sensing and computational technologies of infrastructure-based intelligent transportation systems. The IDS system under consideration is intended to help drivers avoid conflicts with oncoming traffic when they are making left turns under a permissive (i.e., unprotected) green signal. These conflicts account for a significant...

Developing a Web-Based Tool to Track Highway Safety Planning Progress in California

Chen, Katherine L.
Oum, Sang Hyouk
Cooper, Jill F.

A strategic highway safety plan (SHSP) is a comprehensive, statewide, data-driven safety plan that coordinates activities across agencies to reduce traffic fatalities and serious injuries on all public roads. In 2015, California updated its SHSP with the input of hundreds of stakeholders. To implement a multiyear effort that involves many primary actors, the challenge is to track decisions and progress in an efficient manner as well as to have in place a state safety program that is accountable and transparent to its stakeholders. The Safe Transportation Research and Education Center at...

Drivers, Pedestrians, and Cyclists in California Want Complete Streets: Comparison of Results from Roadway Design Surveys of Pedestrians, Drivers, Bicyclists, and Transit Users in Northern and Southern California

Sanders, Rebecca L.
Griffin, Ashleigh
MacLeod, Kara E.
Cooper, Jill F.

This paper compares findings from two recent surveys on roadway design preferences among pedestrians, drivers, bicyclists, and public transit users along major urban corridors in the metro areas of San Francisco and Los Angeles. Sponsored by the California Department of Transportation (DOT), the research explored design preferences that could increase perceived traffic safety, walkability, bikability, and economic vitality along urban arterials. Results from intercept surveys showed that roadway users desire similar design features along the test corridors, which carry 25,000-40,000...