A highway engineer designs, builds, and maintains roads, highways, and interchanges. The work spans everything from deciding where a new road should go and how many lanes it needs, to managing drainage systems, signage, lighting, and pedestrian paths. It’s a specialized branch of civil engineering focused entirely on the infrastructure that keeps vehicles, cyclists, and pedestrians moving safely.
Day-to-Day Responsibilities
The core of a highway engineer’s job is roadway design, but that term covers far more ground than drawing lines on a blueprint. Before any design work begins, the engineer has to determine the exact route a road will take, how it connects with existing roads, and how traffic will flow through the finished system. This means conducting traffic studies, analyzing crash data, and modeling how driver behavior changes with different lane configurations or signal timing.
Beyond the road surface itself, highway engineers are responsible for drainage planning (making sure water moves off and away from the roadway), signal systems, road markings, highway signs, roadway lighting, guide rails, and impact attenuators, which are the cushioned barriers you see in front of concrete walls or bridge piers. Bike lanes, pedestrian crossings, parking layouts, and traffic calming features like speed bumps or narrowed lanes also fall under their scope.
Much of this work happens at a desk. Engineers produce technical reports, create detailed construction drawings, prepare cost estimates, and present plans at public meetings where residents can weigh in on how a project will affect their neighborhood. But the job also pulls them outside regularly to survey sites, inspect construction progress, and verify that what’s being built matches the approved design.
Phases of a Highway Project
Highway projects follow a structured lifecycle, and an engineer’s role shifts at each stage.
Planning and project selection comes first. Transportation agencies identify where roads are failing, congested, or unsafe, and rank potential projects by need and available funding.
Preliminary engineering is where the real analysis begins. Engineers study future traffic demand forecasts, assess impacts on homes and businesses, and evaluate drainage concerns. Environmental review is a major piece of this phase: the team examines whether the project would affect wetlands, threatened or endangered species, historic structures, or landmark trees. These reviews can shape or even reroute an entire project.
Design engineering turns the preferred option into a buildable plan. Engineers produce detailed construction drawings, write specifications for materials and methods, and finalize cost and time estimates. This is also when agreements with local utilities and municipalities get locked in, since road projects frequently require moving water lines, gas pipes, or power cables.
Construction is where the engineer shifts from designer to overseer. They review contractor work, resolve problems that arise when real-world conditions don’t match the plans, and ensure the finished road meets safety and quality standards.
Operations and maintenance continues after construction wraps. Engineers monitor pavement condition, plan resurfacing schedules, and adjust signal timing as traffic patterns evolve over the years.
Tools and Software
Highway engineers rely heavily on two categories of software. Computer-aided design (CAD) programs like AutoCAD Civil 3D and MicroStation are the primary drafting tools, used to produce the detailed drawings that guide survey, design, and construction. These programs handle everything from road geometry and grading to cross-sections showing exactly how deep the pavement layers need to be.
Geographic information systems (GIS) complement the design work by storing and analyzing spatial data in map format. GIS lets engineers layer traffic counts, soil types, flood zones, and property boundaries onto a single map, making it easier to spot conflicts and opportunities early in the design process. State transportation departments increasingly link their CAD and GIS systems so that design files and geographic data flow back and forth without manual re-entry. An engineer working in ArcMap, for example, can pull elevation data directly from CAD linework to build three-dimensional terrain models of a project corridor.
Design Standards and Regulations
Highway engineers don’t design in a vacuum. Nearly every decision is governed by standards published by the American Association of State Highway and Transportation Officials (AASHTO), a nonprofit that represents state transportation departments and acts as a bridge between them and the federal government. AASHTO publishes guides covering roadside safety treatments, lane widths, sight distances, curve radii, and dozens of other design criteria.
One key reference is the AASHTO Roadside Design Guide, which focuses on minimizing injury severity when a driver leaves the roadway. Another is the Manual for Assessing Safety Hardware (MASH), which sets uniform crash-testing guidelines for guardrails, barriers, crash cushions, and other safety devices. Since January 2016, any changes to previously tested safety hardware require new testing under MASH standards before the Federal Highway Administration will approve them for use on federally funded projects. For a highway engineer, staying current with these evolving standards is a routine part of the job.
Education and Licensing
Becoming a highway engineer starts with a bachelor’s degree in civil engineering or a closely related field. Some engineers pursue a master’s or doctoral degree, especially if they want to specialize in areas like pavement materials, traffic simulation, or structural design for bridges and overpasses.
Licensing is where the career path gets more structured. Most highway engineers work toward a Professional Engineer (PE) license, which is required to sign off on designs and take legal responsibility for public infrastructure. The typical path starts with passing the Fundamentals of Engineering (FE) exam, usually taken near the end of college or shortly after graduation. After accumulating several years of supervised professional experience, the engineer applies for PE licensure and takes a second, more advanced exam. Some states allow experienced engineers to apply for a waiver of the FE exam under specific conditions, but the PE exam itself is a universal requirement.
A PE license matters for career advancement. Engineers without one can do design and analysis work, but they can’t stamp plans or serve as the engineer of record on a project.
Salary and Job Outlook
Highway engineering falls under the broader civil engineering category in federal labor data. The median annual wage for civil engineers was $99,590 as of May 2024. Salaries vary based on location, experience, and whether you work for a state transportation department, a consulting firm, or a federal agency. Engineers with a PE license and 10+ years of experience typically earn well above the median.
Employment of civil engineers is projected to grow 5 percent from 2024 to 2034, which is faster than the average for all occupations. Much of this demand comes from aging infrastructure. Bridges need replacement, highways need widening, and stormwater systems need upgrading to handle increasingly intense rainfall. That backlog of work keeps highway engineers in consistent demand across both the public and private sectors.
Who This Career Suits
Highway engineering appeals to people who like solving spatial puzzles with real consequences. You’re balancing competing demands constantly: a road needs to move traffic efficiently, but it also has to be safe for pedestrians, affordable to build, gentle on wetlands, and acceptable to the community it runs through. The work is tangible in a way that many engineering disciplines aren’t. You can drive on the thing you designed, watch thousands of people use it every day, and know it’ll be there for decades. The tradeoff is that projects move slowly. A highway can take five to ten years from initial planning to ribbon cutting, and the regulatory and public review process demands patience and strong communication skills alongside the technical ones.