Mr. Choa is a registered Professional Traffic Engineer in California with over 30 years of experience in multi-modal traffic engineering and signal operations analysis. Fred serves as Fehr & Peers' National Multi-Modal Traffic Operations Safety Leader, mentoring the next generation of leaders based on his experience working on operations (Synchro, VISTRO, Tru-Traffic, PASSER, and TRANSYT),simulation (SimTraffic, CORSIM, Paramics, and VISSIM) and Travel Demand Forecasting (VISUM, Cube and TransCAD) to improve safety and operations for all travel modes (passenger cars, pedestrians, transit, trucks and bicyclists). In addition to being a transportation professional, Fred has enjoyed giving back to the transportation community by being an instructor for the University of California, Berkeley, Institute of Transportation Studies, Technology Transfer Program for the past twenty-six (26) years. On occasion, Fred also teaches as a guest lecturer for both undergraduate and graduate level transportation classes, teaching how to use a combination of the Cube / TransCAD / VISUM Travel Demand Forecasting (TDF) Models and SimTraffic / VISSIM to forecast and analyze corridor operations for automobiles, pedestrians, transit, trucks, and bicyclists.

Mr. Zhou is a registered Professional Civil Engineer and Road Safety Professional in California with more than 10 years of experience in traffic engineering and operations analysis. Diwu is passionate about balancing the often conflicting needs of mobility and safety, and is well suited to provide clients with advice and recommendations backed by research, data, and analysis through his intimate knowledge of traffic operations and design, safety best practices, and big data. He also serves as the Vice-Chair of the Institute for Transportation Engineers' Transportation Safety Council and as a committee member of the Transportation Research Board's Intermodal Freight Transport Committee. In addition to working on projects, Diwu has enjoyed being an instructor for the U.C. Berkeley Institute of Transportation Studies Tech Transfer Program for the past five (5) years where he teaches traffic operations analysis using SYNCHRO and SimTraffic. Diwu is an alumnus of the U.C. Berkeley Institute of Transportation Studies.