Patrick Armijo, PE, P.Eng

Principal Traffic Engineer


Patrick Armijo is a Professional Engineer with 28 years of experience in the public and private sectors. His expertise includes managing traffic signal design, traffic signal operations, and signal maintenance teams. He also has an in-depth knowledge of traffic signal timing, traffic signal synchronization, Transit System Priority (TSP), Emergency Vehicle Preemption (EVP), and at grade railroad crossing safety.

Previously, he has worked as an expert witness with the Washington State Attorney General’s office on cases involving traffic signal operations. He has also worked on cases involving at-grade railroad crossings and design-build transit system dispute resolution.


2021 – Present
Principal Traffic Engineer – LYT

2015 – 2021
Light Rail Signal Supervisor – Santa Clara Valley Transit Authority (VTA)

2014 – 2015
Technical Director, Intelligent Transportation Systems – Western Pacific Signals

2013 – 2014
Project Manager – Advantec Consulting Engineers

2013 – 2013
Director of Traffic Engineering – CivTek International

2010 – 2013
Manager: Traffic Signals, Railroad Crossing Signals, and Community Lighting – City of Lethbridge, Canada

1992 – 2010
Traffic Signal Operations & Transportation Engineer – Washington State Department of Transportation