What We Do
Transportation Planning and Policy
Our research informs transportation planning and policy decision-making at the local, regional and state level.
We work with our sponsors to develop public engagement programs that facilitate meaningful dialogue and advance the state of the practice.
Health and Safety
Our research explores the intersection between transportation, health and safety to offer solutions that contribute to an improved quality of life.
Public Opinion Research
We use qualitative and quantitative data collection methods to analyze public opinion on a range of transportation topics.
Technology, Communication and Data
Our work is on the cutting edge of transportation innovation, communication techniques and data analysis.
Tina Geiselbrecht, CP3
Program Manager, Research Scientist,
Tina’s research focuses on innovation in the public involvement process. Using qualitative and quantitative public opinion research, she supports agencies in conducting meaningful public engagement to facilitate transportation planning and policy decision-making. Tina has been the lead researcher on several projects at the local, state and national level that have explored public opinion through the use of surveys, stakeholder interviews and focus groups. Tina also explores the effectiveness of public involvement processes through systematic evaluation. Her research has produced deliverables that help agencies engage the public in decision-making and help the public to understand their role in transportation and how changes in the system may impact their lives. Tina is certified as a Public Participation Professional (CP3) by the International Association for Public Participation. Read full resume.
Joan Hudson, PE
TTI Research Engineer
Joan has been involved with research activities at TTI since 2001, with a major area of emphasis on Bicycle, Pedestrian, and Transit Safety and Planning as well as Roadway Congestion Management. Her main sponsors include TxDOT, Capital Metropolitan Transportation Authority, the Capital Area Metropolitan Planning Organization (CAMPO), and the City of Austin. Joan has 29 years of experience as a traffic engineer, 11 of those with the City of Austin's Transportation Division where she gained an understanding and appreciation for transportation-related quality of life at all stages of a person’s life. She is involved in bicycle and pedestrian safety education in Texas and has a particular interest in Vision Zero efforts. Read full resume.
Chris Simek, PMP
Associate Research Scientist
Chris has 20 years of project management and travel behavior survey research experience, including 12 years in private sector consulting, and 8 years in university research. Throughout his career, his work and experience has been focused in the areas of travel surveys to support urban transportation models and urban planning policy. Since 2000, Chris has been involved in the management, design, and/or analysis of dozens of travel behavior surveys across the United States and Canada. Chris' professional interests include project management, public opinion research, travel behavior, survey and sample design, weighting and expansion, statistical analysis, and, most recently, transportation public policy. Chris is a certified Project Management Professional (PMP). Read full resume.
Gretchen Stoeltje, JD
Assistant Research Scientist
Gretchen is an Assistant Research Scientist at TTI, where she focuses on communication and policy for existing and emerging transportation issues. Recent project topics have included emerging legislation for automated vehicles, regulation of transportation network companies, transportation funding, shared, app-based and integrated mobility options, online communities in use by governmental entities, and the implications for consent and privacy in the use of passively collected data for transportation research. Prior to joining TTI in March 2014, Gretchen worked as a policy researcher and communications specialist at the Texas Department of Transportation where she developed original research, internal and external media products, managed projects with policy consultants, and helped to facilitate the agency's strategic planning process. Before and throughout her time in state government, Gretchen has worked as an independent documentary filmmaker, producing, directing and distributing three titles of her own and collaborating on many others. Read full resume.
Boya Dai, AICP
Assistant Transportation Researcher
Boya is an Associate Transportation Researcher at TTI who specializes in transportation data collection, management, analysis, and visualization. Her research is focused on traffic safety and pedestrian and bicycle planning. That includes the identification of crash patterns by analyzing spatial distribution of traffic crash data, as well as conducting hotspot analyses to identify prioritized locations for safety accommodations. She assisted Capital Metropolitan Transportation Authority in improving bus safety by researching the potential contributing factors and coming up with corresponding countermeasures. She also contributed greatly to the first Austin District Bike Plan and Pedestrian Inventory. Her work of using Pedestrian and Bicycle Crash Analysis Tool (PBCAT) to collect crash details that are not included in the TxDOT Crash Records Information System (CRIS) has been used by City of Austin in developing the 2018 Pedestrian Safety Action Plan. Read full resume.