Tribal Transportation Safety Assessment (TTSA)

Tribal Transportation Safety Assessment (TTSA)

Participants conducting a needs assessment in Happy Camp, 2019

Needs assessment for the Karuk Tribe (Happy Camp, 2019)

UC Berkeley SafeTREC will be partnering with California Tribes to conduct Tribal Transportation Safety Assessments (TTSAs), beginning November 2021 and to be completed by mid-June 2022. TTSA reports can help tribal staff and leadership plan and prioritize safety improvements for all travel modes (walking, bicycling, transit, driving) on tribal roads and pathways, and on roads accessing tribal lands.

Funded by the Robert Wood Johnson Foundation (RWJF), these engagements are FREE to California tribes.

TTSA engagements include:

  • Collision data analysis by SafeTREC staff
  • Community engagement survey to understand household transportation choices, challenges and opportunities.  (On-line and/or printed)
  • With Tribal staff, selection of several focus (study) areas on or near Tribal lands.  (intersections, corridors, paths, or routes including walk/bike to schools)
  • One-day on-site field visit by a safety expert (walk-audit / drive-about)
  • Detailed illustrated report of findings with analyses, suggestions and concepts

The 2022 TTSA Program

We are partnering with Tribes throughout California for the 2022 TTSA program, including:

  • Ewiiaapaayp Band of Kumeyaay Indians
  • Elk Valley Rancheria
  • Karuk (Yreka)
  • Cedarville Rancheria
  • Redwood Valley Rancheria 
  • Fort Bidwell Indian Community
  • Fort Independence

Questions about the TTSA?

For more information about the program, download the TTSA Flyer or contact Afsaneh Yavari, Research & Development Engineer, at

The assessment will provide a roadmap which allows us to focus on priority issues that will make transportation planning easier and ultimately more effective.
TTSA Tribal Community Participant

The TTSA Program

Since 2015 SafeTREC has conducted 32 transportation safety assessments for California Tribes. The TTSA program is just one of SafeTREC’s free resources for California tribal communities. Others include Tribal Street Story – a map-based “crowdsourcing” tool for gathering community input, and Tribal Transportation Injury Mapping System (TIMS), a map-based crash data search and visualization tool.

Testimonials for the Tribal Road Safety Program

"The Active Transportation Needs Assessment (ATNA) report provides an in-depth review of existing traffic and safety conditions, and also provides suggestions for safety improvements. John walked the reservation and observed problem areas identified by tribal staff and community members. Prior to his site visit, it had been over a decade since the last engineering and planning evaluator visited our community! The ATNA report is a valuable document that will aid our tribal staff, and transportation partners, plan and complete future safety improvement projects. We greatly appreciate the assistance from the National Indian Justice Center and the UC Berkeley, Safe Transportation Research and Education Center."

Chris Nejo, Pala Band of Mission Indians
Pala Administration