Diane Xiao, PE, ENV SP

Project Engineer

Diane is a Professional Engineer in Toole Design’s Seattle office. As a Project Engineer, her skills encompass safety analysis, traffic, and pedestrian analysis, environmental reviews, Transit Signal Priority (TSP), and simulation modeling. Originating from New York City, Diane is passionate about transit and mobility. In addition, she enjoys all things related to Complete Streets, sustainable transportation, and pedestrian, bicyclist, and multimodal design.

After living on the East Coast majority of her life, Diane now spends most of her time exploring the Pacific North West, biking, hiking, and rock climbing.