SafeTREC

Error Consideration for Geocoding Police Reported Collision Data in California

Bigham, John
Oum, Sang Hyouk
2014

Geographic Information Systems (GIS) are frequently used to analyze collision data. In order to utilize GIS, the data must be geocoded, or assigned a latitude and longitude coordinate by translating a descriptive location onto street network data. However, the ability for accurate spatial analysis can be limited by geocoding errors that may occur due to limitations in data collection technologies, incorrect data entry due to human error, or inaccurate street reference data. In the state of California there is an increased opportunity for data entry errors, given the long sequence of events...

Driver/Pedestrian Understanding and Behavior at Marked and Unmarked Crosswalks

Mitman, Meghan F.
Ragland, David R
2008

Pedestrian injuries at crosswalk locations represent a significant problem. In 2002, 22.7 percent of US pedestrians involved in collisions were in a crosswalk at the time of the collision, and over 96% of these occurred at an intersection. Almost all crosswalk collisions resulted in pedestrian injury or fatality (98.6 percent), and about one-third resulted in severe or fatal injury (National Automotive Sampling System (NASS) and General Estimates System (GES) 2002).As the owner of the California State Highway System, Caltrans is responsible for providing access to safe and convenient...

Comparison of collisions on HOV facilities with limited and continuous access

Jang, Kitae
Chung, Koohong
Ragland, David R.
Chan, Ching-Yao
2008

This paper describes comparisons of traffic safety during the morning and afternoon peak hours in extended stretches of eight High Occupancy Vehicle (HOV) lanes with two different types of access – four corridors with continuous access and the others with limited access. Traffic collision patterns in two different types of HOV lanes were investigated by evaluating 1) the differences in collision distribution, severity, types of collisions and per lane traffic utilization, 2) spatial distribution of collision concentrations by using Continuous Risk Profile (CRP) approach, and 3) collision...

Prehospital Care of Road Traffic Injuries in Chiang Mai, Thailand

Brown, MD, Ted
2003

Road traffic accidents (RTAs) cause enormous morbidity and mortality in developing countries. The Global Burden of Disease Study projected that RTAs will be the third highest cause of disability adjusted life years (DALYs) by 2020. Ninety percent of the DALYs due to RTAs are in developing countries. Because the majority of trauma deaths in developing nations occur in the prehospital setting, it is imperative that emergency medical systems be established and improved in such countries. Two studies in Central America found that increasing the number of emergency dispatch units and...

Analysis of Wet Weather Related Collision Concentration Locations: Empirical Assessment of Continuous Risk Profile

Oh, Soonmi
Chung, Koohong
Ragland, David R
Chan, Ching-Yao
2009

The objective of the study described in this paper is to identify common site features that may contribute to high collision rates under wet pavement conditions. To minimize falsely identified high collision concentration locations (HCCL) in evaluating factors contributing to high collision rate, this study accessed the magnitude of false positives (i.e., identifying sites for safety improvements that should not have been selected) by comparing HCCLs identified by the existing conventional sliding moving window approach with the ones identified by the Continuous Risk Profile (CRP) approach...

Limitations of Data on Cell Phone Involvement in Collisions: A Case Study of California

Griswold, Julia B.
Grembek, Offer
2014

With the increasing prevalence of mobile technology and high-profile crashes bringing attention to distracted driving, data on cell phone involvement in collisions is critical for understanding the extent of the problem, examining the effectiveness of policies, and developing interventions to improve safety. Some limitations of existing data have been previously identified, but this paper examines the specific case of California’s collision data. Temporal, geographic, and jurisdictional trends are analyzed to identify the source and type of inconsistencies in the cell phone involvement...

Driver Behavior at Rail Crossings: Cost-Effective Improvements to Increase Driver Safety at Public At-Grade Rail-Highway Crossings in California

Cooper, Douglas L.
Ragland, David R
2007

This report examines conditions affecting vehicle-train collisions at rail crossings in California, and recommends effective countermeasures and implementation strategies. In doing so, the report helps meet California’s goal of efficiently utilizing state and federal funding available through SAFETEA-LU for increasing the safety at public at grade rail-highway crossings.

Fiona Norton

Research Data Analyst
Safe Transportation Research and Education Center
SafeTREC

Fiona Norton is a Research Data Analyst at UC Berkeley Safe Transportation Research and Education Center (SafeTREC), where she supports multiple ongoing research projects.

She holds a B.S. in Business Administration with a concentration in Quantitative Analysis and an M.S. in Quantitative Economics from California Polytechnic State University, San Luis Obispo.

Sujin Lee

Postdoctoral Researcher
Safe Transportation Research and Education Center
SafeTREC

Sujin Lee is a postdoctoral scholar at the Safe Transportation Research and Education Center (SafeTREC) at UC Berkeley.

Her current research focuses on examining how regional characteristics and safety measures contribute to reducing traffic crashes and creating safer transportation environments. She is also interested in the intersection of travel demand and urban attributes, using insights from multifaceted datasets to promote sustainable urban development and enhance travel demand management.

She earned her Ph.D. (2024) and M.S. (2019) from the Graduate School of Mobility...

Pre-Intervention Assessment: UC Davis Medical Center and California Health Care Safety Net Institute Child Passenger Safety Initiative

Cooper, Jill
Ragland, David R
MacLeod, Kara E
Jameson, Wendy
2002

Proper use of child passenger safety (CPS) systems is highly effective in reducing injury and fatality in traffic crashes. While use of CPS systems is increasing, use is not universal, and there is a high level of improper use. The Child Passenger Safety Initiative is an innovative program to provide education and training in proper CPS system use to adults with children attending public hospitals and clinics. The initiative will provide education and resources to these adults. A pre-intervention baseline study with a sample of adults and children at four participating hospitals and...