Though CivTech staff all exhibit the fundamental skills/characteristics—integrity, effective communication skills, enthusiasm, flexibility, technical knowledge, problem solving skills—that we believe are essential to providing a service and delivering a product that exceeds each Client’s expectations, CivTech also seeks out differences in perspective and skills. These different skills and perspectives that CivTech cultivates in each individual is one thing that helps set us apart from our competitors. This unique management philosophy allows us to provide our Clients with innovative approaches to, and creative solutions for, each project. The strengths and skill sets of each individual on the project team will be utilized to efficiently complete various tasks, produce quality products and successfully complete each project. CivTech has assembled a talented team that works together as a cohesive team.


Dawn Cartier

President/Senior Traffic Engineer

Dawn Cartier, PE, PTOE is the President and Principal of CivTech and specializes in traffic and transportation engineering. She graduated from Northern Arizona University with a Bachelor of Science in Civil Engineering. She has 25 years of engineering experience, working with both municipalities and private sector specialists. Her management style assures a positive team approach that is fully committed to the successful completion of any project. Dawn has managed numerous projects in the State of Arizona; her management and design experience includes geometric design, traffic impact analysis, signal design, signing concepts, pavement marking plans, striping plans, ITS, detour design, capacity analysis, and parking studies. She has been involved with many large scale transportation planning, engineering and design projects within Arizona including parts of the regional freeway system and Valley Metro Rail. She has also been involved with the public presentations of several major projects including the Casa Grande Transit Development Study, Red Mountain Freeway, the Northwest Extension of the Light Rail, Villaggio Montana and many proposed traffic interchanges. Dawn regularly presents at council hearings on various projects completed by CivTech.

Sean Messner, PE


Sean Messner, PE is the Director of CivTech’s Pacific Northwest Region and a Senior Traffic Engineer. Sean is an experienced civil engineer and project manager with more than 18 years of experience specializing in traffic engineering analysis, including stop-controlled intersection analyses, roadway safety audits, intersection and corridor safety evaluations, signal warrant analyses, and roundabout analyses. Sean is also fluent in traffic engineering design and preparation of plans, specifications and engineer’s estimate of construction costs, including signing/marking, maintenance of traffic, traffic signals, RRFB, HAWK, advanced beacons, illumination, and ITS systems.

Mick Mathieu, PE

Director, Tucson

Mick Mathieu, PE is the Director of CivTech’s Tucson office and has over 39 years of experience managing Civil Engineering projects and design-build projects in the areas of traffic engineering, roadway and airport design and construction, and construction administration/quality assurance for various clients. Mick’s areas of design experience include horizontal and vertical design, geometric layout, pavement design, traffic signal design, pavement marking and signing design, earthwork and plan quantities take-off construction phasing plans, cost estimates, Special Provisions, Traffic Engineering Reports, Traffic Impact Analysis Reports, coordination with subconsultants, utility coordination, and quality control of design plans.

Larry Wiele, PE

Director of Design

Larry serves as a Senior Project Manager for a wide variety of transportation and civil projects. Over his career, this has included preliminary and final design for major highway improvement projects, location studies, site developments, signal design, interchange design, flood control work and civil work. He has also completed various traffic studies, site impact studies, and roadway safety analysis. Larry is actively involved in client relationships and marketing to both our current and new clients, including the preparation of proposals and interview presentations. Over the past several years, Larry has provided construction management for several complex projects, including several projects which he has taken from preliminary design, through final design and construction.

David Duffy, PE

Project Manager/Senior Traffic Engineer

David Duffy, PE is a Project Manager/Senior Traffic Engineer at CivTech. He has more than 37 years of engineering experience, including 22 years of traffic engineering and transportation planning experience with the Arizona Department of Transportation. The last 11 years were as the Assistant State Traffic Engineer in charge of design and studies. He was successful in reviving the signal, interstate sign rehab and HES programs by delivering more projects, more quickly and obtaining increases to the program funds in the 5-year program. David’s experience includes signing, marking, traffic control, signal, lighting and roundabout designs through the management of the Design Section. He has performed and overseen numerous accident analyses, warrant studies, speed studies, operational studies, no passing zone studies and data collection through the management of the Studies Section. David has been very adept at implementing ideas and programs. Through his experience working with ADOT, Dave is familiar with the development of construction documents for public agencies and the importance of ensuring there are not any ambiguities in the documents before advertising a project for construction. In addition to providing quality reviews of the construction documents, Dave is available to assist agencies in acquiring any Federal Funding for design or construction of traffic signals or other improvements. He is familiar with the Federal Funding options that may be available for local agencies and the requirements for submitting and obtaining Federal Funds.

Joseph Spadafino

Project Manager/Senior Traffic Engineer

Joe Spadafino, PE, PTOE, PTP is a Senior Traffic Engineer with over 38 years of traffic engineering and transportation planning experience. His strengths are in the writing of technical reports, specifications and in conducting detailed research and analyses. Joe excels at the development of traffic impact analyses, traffic signal warrant analyses, speed studies and accident evaluations. Joe recently prepared the traffic impact studies for the Pepsi Distribution Center at NEC Florence/Chuichu Road at Peters Road, McCartney Center, Walmart Center on I-10 and Val Vista Road and Saint Anthony’s Catholic Church Expansion in Casa Grande.

Ben Good

Senior Traffic Engineer

Ben Good, PE, PTOE is a Senior Traffic Engineer at CivTech and has over 17 years of traffic engineering experience in the State of Arizona. His responsibilities have included traffic engineering design of signing/pavement marking, traffic control, traffic signal, traffic signal interconnect and roadway/pedestrian lighting plans. Ben has designed the traffic signal, street/pedestrian lighting and ITS for projects around the state including: Johnson Ranch Signals in Pinal County; Thomas Road Streetscape in Scottsdale; Arizona Avenue, Frye Road to Chandler Boulevard in Chandler; Dobson Road/Guadalupe Road Intersection Improvements in Mesa; Dysart Road/Thunderbird Road Intersection Improvements in El Mirage; and Grand Avenue, 83rd Avenue to 95th Avenue in Peoria. He prepared the signing/marking plans for the following projects: McQueen Road, Riggs Road to Queen Creek Road in Chandler; Canyon Trails Commercial Center in Goodyear; and Higley Road, Mews Road to Stacy Road in Gilbert. In addition to his design experience Ben has prepared numerous traffic studies for private developments as well corridor studies for local agencies, including the Yuma Road Realignment Study and MC85 Intersections Alignment Study for the Town of Buckeye. He is experienced with the Visual Lighting Analysis Software, HCS and Synchro traffic analysis softwares, the FHWA Traffic Noise Model, as well as the AutoCAD and Microstation drafting platforms.

Allison Shinn

Transportation planner

Allison Shinn is a transportation planner with 5 years of public and private sector experience. Allison’s planning experience includes a variety of transportation project including environmental planning, transit planning, and multi-modal planning. Her environmental planning experience includes Alternative Selection Reports (ASR), Environmental Impact Statements (EIS), Environmental Assessments (EA) and Categorical Exclusions (CE). Her experience in transit and multi-modal planning includes long range/short range transit plans, transit master plan, community transit plan, mobility studies, wayfinding projects, feasibility studies, and corridor projects. Allison’s technical skills include GIS, land use analysis, environment justice (EJ) analysis, bus service evaluation, and project prioritization analysis.

Ruth Gutierrez

Transportation Model Specialist

Ruth Gutierrez is a Transportation Model Specialist at CivTech with over 14 years of experience in the traffic engineering/ transportation planning industry preparing traffic impact studies, traffic signal warrant analyses, speed zone evaluations, parking studies, large scale transportation modeling studies, including change of access reports and travel demand modeling. She is proficient with the Synchro/SimTraffic and Highway Capacity Software programs, as well as the TransCAD modeling software and TransModeler simulation software. Ruth recently prepared the traffic impact studies for Casa Grande Commons, Valero 1668 Development, McCartney Center. She also provided the analysis for the City of Maricopa’s Maricopa Transit Feasibility Study.

William Selby


William Selby, EIT, received his Bachelor of Science in Civil Engineering from Arizona State University. Bill interned with CivTech while an undergraduate and as an EIT, works in our Transportation Study group. Bill has experience in both traffic and transportation projects. He is highly proficient in our traffic analysis programs including Traffix and Synchro/SimTraffic. Prior to joining CivTech, Bill served five years in the United States Marine Corps were he earned the rank of Corporal.

Morgan Alkahlout


Morgan received his Bachelor of Science in Civil Engineering from Arizona State University. Morgan started with CivTech as an intern and now works as an Engineer-in-Training in our study and planning groups. He is experienced with both traffic and transportation projects that include traffic impact analysis, traffic impact statements, and trip generation statements for a variety of clients. Morgan is proficient with various traffic analysis programs including Traffix and Synchro/Sim Traffic. He is deeply passionate about transportation and served as ASCE’s 2019 and 2020 PSWC Transportation Project Manager.

Andie Atondo

Traffic Engineering Technician and Transit Analyst

Andie Atondo is a Traffic Engineering Technician and Transit Analyst with 2 years of experience supporting planning and traffic engineering projects for public agencies and private clients. Her recent work includes supporting public agency projects in the cities of Douglas, Flagstaff, Buckeye, and Phoenix. Andie has prepared traffic impact analyses, traffic statements and evaluated corridor and street networks for large area plans. Her work responsibilities include a wide range of services, including research and data collection, transportation data analysis, traffic engineering analysis, and formulating project recommendations.