Expert Witness Services

45+ Years of Trusted Testimony and

Professional Advice for Your Legal Case

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Expert Witness & Litigation Support


Greenlight Traffic Engineering provides support to defendants and plaintiffs involved in traffic crash litigation throughout the United States.

Areas of expertise include signing, pavement markings, traffic signals, lighting, roadway design, pedestrians, bicyclists, and ADA.

Our traffic safety experts will give you an unbiased assessment of your case, and our communication skills in reports, depositions, and court testimony have been key to obtaining successful resolutions for our clients.

Our Services

We develop traffic engineering projects tailored to our client’s needs.

Expert Witness Support

Serving Local, County, Tribal and State DOT agencies with expert witness support for research, documentation, depositions and trial support for pedestrian, bicyclist, and vehicular safety issues.

3rd Party Review

Serving all private and public agency clients with traffic engineering design and study review support.

Traffic Operations Planning

Serving Local, County, MPO/COG, Tribal and State DOT agencies with intersection alternatives analysis, traffic signal coordination, feasibility analysis and benefit/cost analysis.

Expert Witness & Litigation Support

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Our Team

Our team is dedicated to building long-lasting relationships while providing exceptional value to our clients.
Greenlight Traffic owners Mike and Scott have over 45 years of expertise in developing safe and cost-effective transportation projects for our clients.
Mike Blankenship, PE, RSP

Mike Blankenship, PE, RSP


Mike is a professional engineer and is certified as a Road Safety Professional (RSP). He has 35 years of traffic engineering and transportation planning work and leadership with a successful blend of technical, management, and communication skills.   

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Scott Kelley, PE, PTOE

Scott Kelley, PE, PTOE


Scott is a licensed professional engineer (AZ, CA, CO, NM, NV), as well as a Professional Traffic Operations Engineer (PTOE). He has over 18 years of experience in traffic engineering and has developed an expertise in traffic design and transportation planning studies within Arizona and across the country. 

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Collette Frohlich, PE

Collette Frohlich, PE

Project Engineer

Collette is a Project Engineer with 12 years of experience in traffic engineering. She has served municipal clients nationwide. In addition, she has served as the owner’s representative for reviewing private development studies and site plans for the purpose of issuing utility permits. 

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How it Works

Just Four Quick Steps to Project Efficiency

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Greenlight Traffic Engineering

Engineering Safety for over 45 Years

14050 N 83rd Ave Suite 290, Peoria, AZ 85381