Road User Behavior

The 2024 CSSA: Partnering with 16 communities to advance Complete Streets safety improvements

March 29, 2024

This year as part of SafeTREC's Complete Streets Safety Assessment Program (CSSA) we are excited to share that we will be partnering with 16 communities throughout California to identify and implement traffic safety solutions that lead to improved safety for all users.

Participants at the Santa Cruz Complete Streets Safety Assessment conducting a walk audit

The 2024 CSSA Program


Register now for 4/17 Street Story webinar: “I have the data, now what?” Pt. 2

March 26, 2024
I have the data, now what? Part 2Eight people conducting a walk assessment on a neighborhood sidewalk during a Street Story training in Boyle Heights Wednesday, April 17, 2024 | 1pm - 2pm PT | Register now

Register now for SafeTREC...

The 2024 CPBSP: Partnering with 13 communities throughout California for safer walking, biking & rolling

March 25, 2024

UC Berkeley SafeTREC and California Walks are excited to share news about the communities throughout California that we will be partnering with this year as part of our 2024 Community Pedestrian and Bicycle Safety Program (CPBSP)!


Watch the recording: Toolkit for Safe Speed Limit Setting - New Flexibility Under California State Law

February 21, 2024
Want to implement lower speed limits in your community? Watch the conversation with SafeTREC, Caltrans, and Rock Miller, PE to learn how to get started!

Two construction workers install a 25 MPH speed limit sign on the sign of the road.

Two recently passed state laws (...

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 ...

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 ...

July 30, 2021 Webinar: Redesigning the System to Support Safety

July 26, 2021
SafeTREC's Katherine Chen presented in CSCRS Safe Systems Summer Learning Series

The Collaborative Sciences Center for Road Safety (CSCRS) recently launched a new Safe Systems Summer Learning Series that will be held on Fridays...

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...