Engineering

Using highway signs to calculate pi to the 50th digit

Using highway signs to calculate pi to the 50th digit

Using highway signs to calculate pi to the 50th digit

Using highway signs to calculate pi to the 50th digit

By Doug Pacey / ADOT Communications
March 14, 2025
The pi symbol on top of a photo of a highway in rural Arizona.

On March 14, also known as Pi Day by the number lovers and math wizards in our lives, we're calculating pi to the 50th digit using numbered highway signs from across Arizona. 

For some of us, this video is the closest we get to using pi in our daily lives. For others, like ADOT engineers, pi is more than a mathematical constant, it's also regularly used when designing and building highway structures.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

A post shared by Arizona DOT (@arizona_dot)

Engineers Week: Training guided this engineer to a career designing roadways

Engineers Week: Training guided this engineer to a career designing roadways

Engineers Week: Training guided this engineer to a career designing roadways

Engineers Week: Training guided this engineer to a career designing roadways

By Garin Groff / ADOT Communications
February 18, 2025
ADOT engineer Erica Eggen

Erica Eggen knew when entering college that engineering was the right career path for her, thanks in part to encouragement from two grandfathers who were themselves engineers.

But with so many kinds of engineering to choose from – she had been drawn to electrical and later bridge engineering – it wasn’t until she’d entered ADOT’s Engineer in Training (EIT) program that she discovered which kind of engineering she really wanted to pursue. 

For Eggen, that was roadway design engineering.

Yet that was only after sampling just about every other speciality at ADOT and learning the best choice for her was one that involved working with all those other types of engineers. 

“With the EIT program, I learned about the different jobs that people have at ADOT,” Eggen said. “I feel like the EIT program does a really good job seeing what people do and where people fit in. As college students, that’s a really big question: Where do I fit in?”

After 17 years as an engineer at ADOT, Eggen is now a team leader overseeing two engineers and three designers. Her many projects have included overseeing a shoulder widening project on State Route 260 in the Heber area.

And as of today, she’s working on two of the largest, most high-profile projects in Arizona: The I-10 Gila River bridge replacement project between Phoenix and Casa Grande, and the I-40/US 93 system-to-system interchange project in Kingman.

For these projects, roadway design engineers consult with experts across ADOT. That means specialists in bridge engineering, drainage, environmental, geotechnical, pavement design, utilities, right-of-way, landscape architecture and more. 

“There’s about 10 different teams that we work with on a regular basis, and that’s on almost every project,” Eggen said. “That’s one thing the EIT program teaches you.” 

Eggen now enjoys getting to work with people enrolled in ADOT’s EIT program as their rotation through various departments include roadway design. The newest generation of ADOT engineers not only get to meet other engineers they’ll work with on future projects, but they also get a taste of each kind of engineering before deciding which is best for them. 

“If you have a chance to do the EIT program, it’s something you’ll be glad you did for the rest of your career because it’s rare that you’ll have a chance to try different types of engineering,” Eggen said. 

 

Engineers Week: In-house training sparked a career leading Phoenix-area projects

Engineers Week: In-house training sparked a career leading Phoenix-area projects

Engineers Week: In-house training sparked a career leading Phoenix-area projects

Engineers Week: In-house training sparked a career leading Phoenix-area projects

By Doug Nintzel / ADOT Communications
February 17, 2025
Jimmy the Engineer

Jimmy Naujokaitis knew the Arizona Department of Transportation was a good fit for him, even during his first training at the agency.

“I had always hoped to make ADOT a career,” said Naujokaitis, who now serves as a Senior Resident Engineer in ADOT’s Central District in Phoenix.

“With all the different projects I’ve been able to work on over the years, it has been a wild experience,” said Naujokaitis. “But it’s something for which I’m grateful.”

It all came down to getting his foot in the door.

“I was studying civil engineering at ASU and that sparked an interest in transportation engineering. I decided I wanted to work in what’s known as the heavy civil industry, as either a designer or a construction manager,” said Naujokaitis.

He graduated from ASU in 2011, then worked at a local structural engineering firm before another door opened. Jimmy earned a spot in ADOT’s Engineer in Training (EIT) program in the summer of 2013.

“Being in the EIT program meant working in groups ranging from traffic and roadway design to maintenance and materials testing,” said Naujokaitis. “One of the biggest benefits from rotating among specialties was making business contacts that have continued to pay dividends during my career.”

And among the highlights from his training at ADOT?

“The field visits were the highlights,” he said. “There were site visits and field investigations with every group. It could range from a Traffic Design group’s roadway striping review to a Roadway group’s guardrail field inspection. There were valuable months spent working in a construction field office in Flagstaff where I learned a lot by being involved with several projects.”

The experience was an important step in becoming an engineer at ADOT. The EIT program confirmed his interest in staying with the Department.

“I was able to see how each group within the agency interacted and supported each other in the development and construction of roadway projects,” Naujokaitis said. “I was able to work with a number of ADOT engineers and supervisors who all told me to keep learning and to keep asking questions. That’s what I would pass along to future engineers-in-training.”

In fact, he’s already done that. Most recently, Naujokaitis has led teams working on big projects including the reconstruction of the Interstate 17 bridges over Central Avenue; the modernization of the I-17 regional drainage system between Dunlap Avenue and Greenway Road; as well as important pavement improvements along I-17 in north Phoenix. They all involved challenges.

“I’ve had the opportunity to host a number of E-I-T members in our office over the years, knowing how important it is to provide them with institutional knowledge and some wisdom,” said Naujokaitis. “You’ll benefit by being willing to participate, putting in the extra effort and experiencing new things while rotating around the Department. You truly will get out what you put into it.”   

 

Behind every highway project, an engineer is translating plans into pavement

Behind every highway project, an engineer is translating plans into pavement

Behind every highway project, an engineer is translating plans into pavement

Behind every highway project, an engineer is translating plans into pavement

By Garin Groff / ADOT Communications
February 24, 2023
broadband rectangle 2_0

The next time you trek to Las Vegas and notice work crews are widening another section of US 93, you might pause for a moment to think of the work of Kara Lavertue.

Lavertue’s role at ADOT includes working on high-profile improvements like widening that busy highway between Sin City and Phoenix, but her job doesn’t involve grading the roadbed or running asphalt paving machines. That’s because Lavertue is one of many engineers at ADOT whose work is more behind the scenes, in this case overseeing construction projects.

It’s important work because engineers like Lavertue ensure every element of the preparation and construction are done to precise specifications so the pavement, bridges and even drainage are reliable and safe for decades to come.

“We hold contractors to specifications and plans and make sure projects are built the way they’re supposed to be built,” she said.

Lavertue is a resident engineer in ADOT’s Prescott Valley office. She holds a civil engineering degree from the University of New Mexico and has worked at ADOT since 2000, first as part of a design team. She’s been a resident engineer since 2018, overseeing construction projects once they’re awarded to a contractor.

Her projects span parts of northwestern Arizona and have included pavement preservation, roadway widening and installing broadband along Interstate 17. The broadband project is not a routine highway project, as it is in cooperation with the Arizona Commerce Authority to create more affordable opportunities to provide rural communities with high-speed internet service. However, ADOT plans to use the fiber to provide “smart highway” technology for things such as overhead message boards, traffic cameras, weather stations and wrong-way driving detection technology.

The job means more than straightforward engineering, as a great deal of management work goes into successfully completing projects. And the projects can be about more than just improving or adding pavement. When building a wildlife overpass, ADOT engineers worked with other stakeholders such as the Bureau of Land Management and the National Park Service.

“We see a little bit of everything,” Lavertue said.

EDITOR'S NOTE: As part of National Engineers Week, which calls attention to the importance of engineering and career opportunities in engineering, ADOT is featuring different aspects of engineering at ADOT.

Untitled design

CADD: It’s not a game

CADD: It’s not a game

CADD: It’s not a game

CADD: It’s not a game

By Kathy Cline / ADOT Communications
February 24, 2023
CADD engineer

At first glance, Computer-Aided Design and Drafting ‒ or CADD ‒ looks like a really cool video game: cool colors, neat graphics, and the ability to change just about anything at the push of a keyboard button. However, CADD is not a game for the engineers in ADOT’s Roadway Design Division. CADD is where all ADOT roads and structures, such as roundabouts, begin to take shape.

“If changes are needed, or alternatives need checking,” Roadway Design Manager Doug Smith said, “we can look at that as projects develop.”

Used at ADOT since 1987, also allows 3-D modeling of structures, such as bridges and freeway interchanges. This allows engineers to see what the highway will look like in the landscape.

Ken Brown, Transportation Engineering Specialist with ADOT’s Roadway Technical Support Section, says many other groups within Infrastructure Delivery and Operations (IDO) use CADD.  Bridge Group, Roadway Group, Traffic Group, Right of Way Group, Utilities and Railroad Engineering, Districts, etc.

Once designs and plan sheets are made, developed and drafted they’re used in the office and the field. For example, Brown said, a CADD design can be loaded into the computer of construction equipment and programmed to work from the design. That saves time, as well as confusion, on job sites. In the office, teams check and double-check measurements and figures to make sure work conforms to national standards and the design needed.

CADD began life in 1957, when Dr. Patrick J. Hanratty developed PRONTO, the first commercial numerical-control programming system. Since then, the program has been through numerous refinements and standardization. Right now, Brown says, CADD training takes up to three weeks; engineers learn how to use the program, what can be done with it, and standards that are used and applied throughout the program.

Like all technology, CADD will continue to evolve. It’s come a long way since it was first used at ADOT in 1987 and improvements will benefit Arizona motorists.

“It’s a great design tool,” Smith said.

A salute to engineers 

A salute to engineers 

A salute to engineers 

A salute to engineers 

By John Halikowski / ADOT Director
February 21, 2022

As a young boy, my favorite thing was to build rivers and reservoirs and dams from big puddles after a rainstorm, and channel the water using old pieces of pipe my dad had lying around. Little did I know back then that I would be leading a state agency, made up of the best and brightest engineering minds who build and maintain an efficient and safe transportation system for the traveling public.

Feb. 20-26 is National Engineers Week. I wish to congratulate and extend my thanks to our Arizona Department of Transportation engineers for the work they perform each and every day. 

ADOT employs engineers with diverse backgrounds and fields of expertise. We have engineers who are environmental planners, bridge designers and surveyors, while others specialize in fields such as civil, utility, railroad, transportation systems, traffic and roadway. All of them work together to create a safe and reliable transportation system we can be proud of in Arizona.

To be an engineer requires an interest in math, science, technology…the STEM-related courses, and then applying that knowledge in a particular field of study. For some it starts as a love of Legos or building bridges with toothpicks. No matter where the interest comes from, ADOT looks to foster engineering skills. Sometimes that starts with an ADOT Kids activity or it might be the mentoring an engineer-in-training receives. 

While I didn’t pursue an engineering degree, I still get the opportunity to work alongside engineers and marvel at their ingenuity in building infrastructure to last for years to come.

Again, congratulations to all the engineers in Arizona! If you see an engineer, tell them thanks for a job well done and ask them why they became an engineer. I wouldn’t be surprised if they say, “I like to build things.”

Gregory Byres named incoming State Engineer

Gregory Byres named incoming State Engineer

I-17 101 traffic interchange

Gregory Byres named incoming State Engineer

Gregory Byres named incoming State Engineer

January 13, 2022

Gregory Byres named incoming State Engineer

ADOT veteran succeeds retiring Dallas Hammit

PHOENIX - Gregory Byres, P.E., has been named the incoming Deputy Director for Transportation and State Engineer for the Arizona Department of Transportation. He will succeed Dallas Hammit, who is retiring after 22 years with ADOT. 

Byres is a seven-year veteran of the Department, having served as a senior project manager, State Roadway Engineer and in his current position as Director of the Multimodal Planning Division. As State Engineer, he will support and coordinate operations of all ADOT transportation divisions to provide a safe and reliable transportation system for the state. 

Prior to coming to ADOT, Byres owned an engineering consulting firm, which provided design services for transportation, airports, utilities and development projects for both private and public sectors. He also has a background as a consulting engineer on transportation, airport and utility projects and as a geotechnical/materials engineering consultant. 

“Greg Byres is bringing a wealth of knowledge, experience and a diverse engineering background to the vital job of State Engineer,” said ADOT Director John Halikowki. “ADOT has a lot of innovative projects underway statewide to expand and improve our transportation infrastructure. Greg’s professional expertise will be invaluable to fulfilling our mission to ‘Connect Arizona. Everyone. Everywhere. Every Day’.” 

Byres is a graduate of New Mexico State University with a Bachelor of Science Degree in Civil Engineering Technology and he studied Geotechnical Engineering at the University of Missouri – Rolla.

 

 

 

For these trainees, the road to engineering starts with ADOT

For these trainees, the road to engineering starts with ADOT

For these trainees, the road to engineering starts with ADOT

For these trainees, the road to engineering starts with ADOT

By Laurie Merrill / ADOT Communications
July 30, 2021

When it comes to hiring promising young engineers for the Arizona Department of Transportation, there’s probably no bigger cheerleader than Candee Samora.

After all, Samora, ADOT’s Engineer-in-Training and Intern Program manager, has landed her dream job and brings her considerable enthusiasm to work every day.

“I’ve wanted to work for state government since I was 12 years old,” she said. “And I wouldn’t want to be anywhere else but ADOT.”

She gets to work with young engineers in training, who also bring considerable enthusiasm to their roles.

“They bring excitement, new blood, new ideas,” Samora said. “They are fabulous.”

In interviews, engineers-in-training (EIT) extolled the virtues of a program that provides so much education and training in so many areas and allows them to see the role of engineering in major projects from start to finish.

“Working with projects so large-scale and critical for the traveling public has been very interesting to see and be a part of every step of the way,” said Brandy Wagoner, recently assigned to Deer Valley Construction.

In the video above, we interviewed Jimmy Naujokaitis, an ADOT resident engineer in Phoenix, who is an enthusiastic graduate of the EIT program. 

"Being in the EIT program allows you to get integrated into ADOT culture and see how things are run," he said. 

Like a lot of future engineers, when he was a kid he excelled in math, science and Legos! 

ADOT can choose from a wide pool of applicants since the agency no longer requires a Fundamentals of Engineering certificate for eligibility.

Recently, the criterion shifted and trainees are required to pass the exam during the 2-year-program, Samora said.

ADOT also sets the trainees on the path for passing their Professional Engineer license, which is considered the highest standard of competence. 

They receive an apprentice-style education that provides hands-on experience and side-by-side mentoring in such disciplines as roadway design, environmental planning, multimodal planning and materials lab. Every few months, they rotate between Roadway Design, Project Management and outlying rural construction projects.

We recently asked a few engineers in training about what they like best about ADOT’s EIT program. Here are some of the highlights:

Wagoner, also quoted above, added that she likes seeing “first-hand how massive transportation projects travel from a vision, to a project, to each design team and how they work together to complete the design, to bid, and finally to construction.”

And the work environment is excellent.

“The atmosphere of being an ADOT EIT is so welcoming, encouraging and creates an environment that I have always felt comfortable and supported in,” Wagoner said.

Diana Palma, recently assigned to the Transportation Systems Management and Operations (TSMO) Division, enjoys learning first-hand about each unit’s responsibilities and the potential for career progression within the state. 

She also listed “the opportunity to apply principles of the Arizona Management System to everyday activities and to see the positive impact on practices.”

Babak Dehghani called the program “an amazing introduction into the professional world.”

He enjoys seeing how ADOT brings construction projects from beginning to finish and how, by working under registered professionals, he has gained the training and experience to become registered as a professional engineer.

Steven Neher, recently assigned to the Multimodal Planning Division, listed the opportunity to work with many different groups, field visits, chances to grow and career development.

“All of these reasons culminate in this grand chance to better myself as a person, an engineer, and a professional, laying the foundation for techniques and habits that can help serve me to my benefit for years to come,” Neher said. “Every road starts somewhere and I'm glad mine began with ADOT.”

ADOT Kids: Legos and treehouses led to this engineer's career!

ADOT Kids: Legos and treehouses led to this engineer's career!

ADOT Kids: Legos and treehouses led to this engineer's career!

ADOT Kids: Legos and treehouses led to this engineer's career!

By David Rookhuyzen / ADOT Communications
June 7, 2021

What do Legos and treehouses have to do with growing up to work for ADOT?

Well, for Micah Hannam, the assistant district engineer for the Central District in Phoenix, those helped him start on the path toward becoming an engineer. From an early age he knew that he liked math and numbers, and loved to build treehouses and play with Legos. That's why he knew he would grow up to build things.

Does that sound like you?

Then maybe you have a bright future as an engineer too! There are so many different engineers working for ADOT, from civil engineers that prepare technical drawings on how to build roads and bridges, to utility engineers who make sure water, gas and electricity are not disrupted during construction. You can read all about the different types of engineers we have in this previous blog post.

What has Hannam been able to do so far?

He was part of the team that designed and built a new bridge on State Route 347 in the City of Maricopa, where the road needed to go over some railroad tracks that trains were using up to 60 times a day!

He also helped with a project to repave State Route 88 between Apache Junction and Canyon Lake. You can see in the video above how that road looks now.

Imagine what you could make!

Hannam said the best way to get started is to just keep doing what interests you now, whether that is building treehouses, programming computers or playing with robotics.

"As long as you are enjoying what you are doing, there's something for you in engineering," he said. 

If you are really interested in being an "engineer-as-a-career," watch for more ADOT Kids videos, blogs and activities. Also, make sure to check out the Engineer as a Career section of the ADOT Kids website or find #ADOTKids on social media!

ADOT’s dust detection system named as a ‘Gamechanger’

ADOT’s dust detection system named as a ‘Gamechanger’

I-17 101 traffic interchange

ADOT’s dust detection system named as a ‘Gamechanger’

ADOT’s dust detection system named as a ‘Gamechanger’

March 24, 2021

 

The first-of-its-kind dust detection and warning system installed by the Arizona Department of Transportation has been named one of the “Infrastructure Gamechangers” by the American Society of Civil Engineers (ASCE).

The detection system, which was completed by ADOT on a 10-mile stretch of Interstate 10 between Phoenix and Tucson in 2020, is among only four highway-related projects recognized nationally this year by the ASCE. The organization recognizes groundbreaking projects that represent the latest advancements in the way engineers plan, build and adapt to infrastructure needs. 

In announcing the national “Gamechangers,” ASCE President Jean-Louis Briaud said, “With resources stretched thin, finding solutions that can make the most of the tools afforded us can driver safety, variable speed corridor, be a challenge, but is an essential component of improving the built environment. ADOT’s dust-monitoring system will keep drivers safe and I-10 drivers moving efficiently. This project highlights the innovative nature of civil engineers, adapting to unique challenges to ensure our systems better serve the public.”

ADOT State Engineer Dallas Hammit added, “This recognition by our engineering peers is gratifying because it acknowledges the tremendous innovation and creativity that has gone into developing a system that will greatly enhance safety for drivers travelling through what can sometimes be a very challenging environment.”

Driving on Interstate 10 between Phoenix and Tucson during summer monsoon months can be hazardous when windblown dust reduces visibility, causing dangerous driving conditions. This technology has created an unprecedented innovation that helps increase driver safety. 

“Safety is our first priority and this first-of-its-kind technology answers a real need to make a very busy portion of highway much safer for motorists. It has already proven its effectiveness in recent dust storm events,” said Brent Cain, the director of ADOT’s Transportation Systems Management and Operations Division “Being chosen as an ASCE Gamechanger is a great honor.”

Drivers passing through the detection and warning zone encounter signs saying “Caution: Variable Speed Limit Corridor.” Soon after, a series of programmable speed limit signs every 1,000 feet can change the legal speed limit from 75 mph to as low as 35 mph. Additional variable speed limit signs are placed every 2 miles.

Overhead electronic message boards in and near the corridor alert drivers to blowing dust and warn them to slow down. Speed feedback signs inform drivers of their actual speeds.

Thirteen visibility sensors mounted on posts along the freeway use light beams to determine the density of dust particles in the air. Once visibility drops to certain levels, the system activates overhead message boards and the variable speed limit signs.

The sensors are complemented by a weather radar on a 20-foot tower at I-10 and State Route 87. It can detect storms more than 40 miles away, providing additional warning of incoming storms to ADOT and forecasters at the National Weather Service.

This technology is monitored by ADOT’s Traffic Operations Center in Phoenix, where staff can see real-time information on conditions such as the speed and flow of traffic. Closed-circuit cameras provide visual confirmation of conditions along the roadway and in the distance.

For additional information on dust storms and safety: www.pullasidestayalive.org