Data collection

California Traffic Safety Survey 2020

Ewald, Katrin
Wasserman, Lisa
2020

The 2020 wave of data collection for the California Traffic Safety Study was conducted with an online panel of California drivers instead of an intercept interview, as were previous waves of data collection. This decision was made due to the COVID-19 pandemic occurring in 2020, and the need for an alternative data collection mode avoiding in-person contact between field interviewers and respondents. The survey questions and data analysis of survey items presented in this report are similar to previous waves of the survey, including survey items on traffic safety opinions and knowledge on...

California Traffic Safety Survey 2018

Ewald, Katrin
Wasserman, Lisa
2019

The 2018 California Traffic Safety Study is the ninth wave of a statewide representative survey of California vehicle drivers on traffic safety perceptions, distracted driving and level of awareness of traffic safety media outreach campaigns. The following data analyses is based on 1,395 survey responses collected in August and September of 2018.

The analyzed data only includes the valid answers for survey items, while excluding all reported “Don’t know” responses as well as response refusals. For this reason, the valid percentage of responses differs for each question due to the...

Injury Crashes in California During COVID-19: Observations & Questions

June 4, 2020
Submitted by Offer Grembek
Preliminary observations and important questions about traffic safety during COVID-19 based on provisional weekly police-reported injury crashes on state highways in California How to study traffic safety in a rapidly changing environment?

The COVID-19 pandemic has had an abrupt impact on many aspects of our lives, including mobility. This has a direct impact on exposure (i.e., the level of activity on the roads), but can also trigger other responses that can affect road user behavior. Due to the rapid rate of change there is a need to monitor things...

The California Speeding and Aggressive Driving Study 2019

September 24, 2019
SUBMITTED BY LISA PETERSON

UC Berkeley SafeTREC is excited to release the California Speeding and Aggressive Driving Study 2019 led by Ewald & Wasserman Research Consultants (E&W). This study was conducted on behalf of the California Highway Patrol (CHP) and the Safe Transportation Research and Education Center (SafeTREC) at the University of California, Berkeley.

The 2019 Survey

The Speeding and Aggressive Driving Study 2019 report describes the analysis results of the second wave of a statewide California Public Opinion Survey on driver perceptions on speeding and aggressive driving on California...

New Research Brief: Community Trainings at Work

September 22, 2019
SUBMITTED BY LISA PETERSON

The Community Pedestrian Bicycle Safety Training (CPBST) program trains and mobilizes communities to address pedestrian and bicycle safety and strengthens collaboration with local officials and agency staff. This research brief summarizes an evaluation of the CPBST program completed in 2018. Read the full research brief.

...

Community Trainings at Work: An Evaluation of Community Pedestrian and Bicycle Safety Trainings

Beck, Kate M.
2019

The Community Pedestrian Bicycle Safety Training (CPBST) program trains and mobilizes communities to address pedestrian and bicycle safety and strengthens collaboration with local officials and agency staff. This research brief summarizes an evaluation of the CPBST program completed in 2018.

Why Don't Women Cycle? A Case Study of Women's Perceptions of Cycling in San Francisco

Funaki, Dorry
2019

Safety and women’s perceptions of safety is a prevalent factor affecting the gender gap of cycling within the US. In this study, the use of bike lanes in the South of Market Area of San Francisco found that only 29% of the cyclists were female despite accounting for 50% of the population in the area. This research brief summarizes key issues found in this study of women’s perceptions of safety when cycling.

Investigating the underreporting of pedestrian and bicycle crashes in and around university campuses - a crowdsourcing approach

Medury, Aditya
Grembek, Offer
Loukaitou-Sideris, Anastasia
Shafizadeh, Kevan
2017

In this paper, the non-motorized traffic safety concerns in and around three university campuses are evaluated by comparing police-reported crash data with traffic safety information sourced from the campus communities themselves. The crowdsourced traffic safety data comprise of both self-reported crashes as well as perceived hazardous locations. The results of the crash data analysis reveal that police-reported crashes underrepresent non-motorized safety concerns in and around the campus regions. The spatial distribution of police-reported crashes shows that police-reported crashes are...

Evaluating Research on Data Linkage to Assess Underreporting of Pedestrian and Bicyclist Injury in Police Crash Data

Doggett, Sarah
Ragland, David R.
Felschundneff, Grace
2018

Traffic safety decisions are based predominantly on information from police collision reports. However, a number of studies suggest that such reports tend to underrepresent bicycle and pedestrian collisions. Underreporting could lead to inaccurate evaluation of crash rates and may under- or overestimate the effects of road safety countermeasures. This review examined ten studies that used data linkage to explore potential underreporting of pedestrian and/or bicyclist injury in police collision reports. Due to variations in definitions of reporting level, periods of study, and study...

Emergency Medical Services (EMS) and the California EMS Information System (CEMSIS) Working Paper

Doggett, Sarah
Ragland, David R.
Felschundneff, Grace
2019

This study examines data from the California EMS Information System (CEMSIS) to identify factors that influence prehospital time for EMS events related to motor vehicle collisions (MVCs). While only 19 percent of the United States population resides in rural areas, over half of all traffic fatalities involve rural motor vehicle collisions. Rural and urban MVCs result in similar injury severities, however relative inaccessibility of trauma centers and prehospital EMS time (activation, response, and transport time) likely contribute to the generally higher mortality rate in rural areas...