I had the pleasure of working with Sean (Kellar Engineering) on the 37th Street Connector Project in Loveland, Colorado.  Sean provided traffic-engineering design support to the J-U-B Engineers team, which included roundabout design and a full traffic study for the corridor.  Throughout the design process, Sean was responsive, supportive, and provided common sense solutions.  I would highly recommend Kellar Engineering for traffic engineering and project management.

After an initial drawing review for one of our church projects in Arizona, we received a comment that required us to provide a Traffic Impact Study before we would be given building approval. While the project timeframe was aggressive and needed to be re-submitted as soon as possible, we quickly searched for an engineer who could help us out.
Sean Kellar was one of the engineers contacted, and he turned out to be a truly remarkable find. His quick response and knowledge on the subject made for a smooth re-submittal. While traffic impact studies can often become long and costly tasks, Sean informed us about alternative options that we may look to explore before going down the route of performing a full study. From Sean’s recommendation, we decided to provide a Traffic Impact Statement instead, which led the client to save a substantial portion on time and fees in doing so.
Sean’s honest character, knowledge and efficiency in his area of work is invaluable and I look forward to using his services for any future needs.

I’ve had the pleasure of working with Sean Kellar at Kellar Engineering on several projects. He is easy to work with, extremely responsive, follows through on his commitments, and is an excellent traffic engineer. I enjoy working with him and wouldn’t hesitate to recommend him for all of your traffic engineering needs including roundabout design.

We have been very impressed in working with Sean over the past decade. He had a very common sense approach through his work at the City of Loveland. The insight and responsiveness that Kellar Engineering contributes adds significant value to our projects.

Sean has been a very professional and helpful engineer to work with, both as a City engineer and as a consultant.  Sean is committed to great customer service and completes high quality work.  I highly recommend him for your transportation needs.

I’ve recently had the opportunity to work with Sean on a subdivision.  Not only was Sean incredibly knowledgeable about the City’s traffic requirements and code for our project, but he was also able to maintain our tight submittal schedule by providing accurate Traffic Study documents on time that the City was able to approve with their first review.  Sean understands the importance of maintaining entitlement schedule as it relates to the overall success of a development project.

Sean and Kellar Engineering are a great asset to any development team.  They are efficient and professional in coordinating the many technical submittals and reports, and also willing to work through the small intricacies and conflicts encountered to provide the best product and value to the end client.

Sean is not only an excellent traffic engineer but also extremely personable and great to work with.

I’ve had the opportunity to work with Sean over several years and found him thorough and fair handed.  He welcomed innovation while being sensitive to needs of all stakeholders.  I know Sean to be virtuous man and respectable engineer.

Sean is a dependable and reliable traffic engineer.  He has met our project deadlines and has had good relationships with municipalities in northern Colorado while working on our projects.  AGPROfessionals would recommend Kellar Engineering for traffic impact studies and traffic engineering services.

I have had the opportunity and pleasure to work with Sean on several projects in the City of Loveland, Colorado.  His transportation experience, engineering judgment and commitment to professionalism really shows in the outstanding quality of his work. I consider Sean to be my most reliable Go-To engineer for excellent advice and thoughtful opinions.

I’ve worked with Sean for a number of years and find him to be very knowledgeable and efficient.  He provides solid work at a fair price.  Sean has a valuable knowledge of the development review process which is helpful in keeping projects moving forward.  I definitely recommend using Kellar Engineering for Traffic Impact Studies.

Working with Sean has been a wonderful experience!  He is a progressive thinker and has great ideas.  I highly recommend Sean to anyone needing a traffic engineer!

TTLC would like to thank Kellar Engineering for your dedication and hard work regarding the traffic planning on Lee Farm project in Loveland.  Your expertise, professionalism and knowledge have been instrumental for the submittal of our 750+ lot master planned development.  Furthermore, your knowledge, teamwork and guidance has saved us time and money as evident in the zero comments received on our submittal.  Thank you for your dedication on this project.

I’ve had the pleasure of knowing and working with Sean Kellar for over 20 years, beginning with our time together at the City of Loveland on transportation and traffic development reviews. Sean also played a key role in assisting me with the last major revision of the Larimer County Urban Area Street Standards (LCUASS).

Sean brings a wealth of knowledge in transportation and traffic engineering, and his technical expertise is matched by his integrity and excellent communication skills. He is a trusted professional and a great person to work with.

I highly recommend Kellar Engineering for transportation and traffic engineering review services.

Bringing Sean Kellar on board for a high-profile, fast-moving development project was a great decision.
Despite late-stage involvement, Sean seamlessly integrated into our team of engineering consultants effortlessly, approaching the challenge with genuine professionalism; a natural fit.

His responsiveness was exceptional—every inquiry and request were met with timely, thoughtful communication. The analyses provided were thorough and data-driven, yet clearly explained the analysis, which was crucial given the controversial nature of the project.

What stood out most was the consistent focus on client service. Their ability to adapt quickly while maintaining clarity, professionalism, and precision ensured alignment with the larger project goals.

If you’re seeking a transportation consultant who adds value from day one, communicates with ease, and delivers practical, intelligent solutions without needless complexity, consider Kellar Engineering.

Sean has been doing a great job for the Town of Timnath, providing thorough development reviews of roundabouts and traffic studies. His strong knowledge of LCUASS and professional approach have been valuable in supporting safe and efficient community growth.