A Legacy of Infrastructure Leadership

For decades, the Society of Highway Engineers (SHE) has stood at the intersection of civil engineering and transportation innovation. As the industry pivots toward autonomous transportation systems (ATS), the society has emerged as a critical force in translating cutting-edge research into real-world infrastructure. This article examines how SHE’s work in research, standardization, training, and policy collaboration is helping to build the physical and digital backbone for self-driving vehicles.

Origins and Evolution of the Society of Highway Engineers

Founded in the mid-20th century, the Society of Highway Engineers was established by a coalition of civil engineers, urban planners, and transportation officials who recognized the need for a dedicated professional body focused on highway design and safety. Early efforts concentrated on pavement engineering, traffic signal optimization, and bridge load standards. By the 1990s, SHE began to formally incorporate intelligent transportation systems (ITS) into its technical committees, laying the groundwork for autonomous vehicle work.

Today, SHE’s membership spans government transportation departments, private engineering firms, academic researchers, and technology startups. The society’s annual symposia and technical publications serve as a primary venue for sharing advances in sensor fusion, cybersecurity for vehicle-to-everything (V2X) communication, and adaptive traffic control algorithms. This broad constituency enables SHE to influence both policy and practice at state, national, and international levels.

Key Contributions to Autonomous Transportation

Research and Development: Enabling Perception and Connectivity

SHE has sponsored and coordinated dozens of research initiatives that directly support autonomous vehicle deployment. A major focus area is sensor integration for roadside infrastructure. Working with university partners, SHE-funded projects have tested lidar and radar configurations for intersection monitoring, creating datasets that help vehicle perception systems predict pedestrian and cyclist movements with greater accuracy.

Vehicle-to-infrastructure (V2I) communication represents another pillar of SHE’s R&D portfolio. The society has supported pilot deployments of dedicated short-range communications (DSRC) and cellular-V2X equipment on arterial roads and freeways. These projects capture real-world latency and reliability data, which are essential for setting engineering benchmarks. One notable outcome is the development of a standardized message set for road geometry and signal phase and timing (SPaT), which allows autonomous vehicles to “see” traffic light status even in heavy rain or glare.

SHE also underwrites safety testing protocols for autonomous systems. Controlled field trials at closed-course facilities have evaluated how automated emergency braking interacts with roadside barriers, how lane-marking visibility degrades under wear, and how edge-case scenarios (e.g., construction zones, emergency vehicle passage) can be safely navigated. The resulting white papers and recommended practices are freely available to member organizations, accelerating knowledge transfer across the industry.

Standardization Efforts: Creating a Common Language

Perhaps no contribution has been more consequential than SHE’s work on standards. Autonomous vehicles from different manufacturers must communicate with traffic signals, toll gantries, work-zone beacons, and data clouds in a consistent way. SHE has led technical committees that draft consensus-based standards under the umbrella of the American Association of State Highway and Transportation Officials (AASHTO) and the International Organization for Standardization (ISO).

Key standards include guidance on roadside unit (RSU) placement to minimize radio interference, data message formats for weather and road condition alerts, and cybersecurity authentication for infrastructure-to-vehicle commands. Without these specifications, a vehicle from one OEM might misinterpret a lane-closure notification from a municipality using a different software stack. SHE’s standards harmonize these variables, reducing deployment costs and liability risks for both public agencies and private fleets.

In addition, SHE publishes a widely used Engineering Guideline Series for Connected & Automated Vehicles. These documents cover everything from procurement language for V2I hardware to inspection protocols for fiber-optic backhaul. Local transportation departments often adopt the guidelines verbatim in their requests for proposals (RFPs), creating a de facto industry baseline.

Training and Education: Building a Skilled Workforce

Engineers who understand both pavement design and machine learning are rare. SHE addresses this talent gap through a tiered education program. The society offers specialized certificate courses in autonomous vehicle infrastructure, covering topics such as sensor calibration, edge computing for traffic controllers, and data privacy compliance. More than 2,000 professionals have completed these courses since 2020, according to SHE’s annual impact report.

Beyond formal courses, SHE organizes hands-on workshops at its biennial conference. Attendees can operate simulation software that models traffic flow under varying levels of automation, evaluate the performance of different V2X antenna designs in an anechoic chamber, or practice cybersecurity incident response in a tabletop exercise. This experiential learning is especially valuable for engineers transitioning from traditional highway design to smart infrastructure roles.

The society also maintains a digital resource library with case studies, webinar recordings, and open-source code repositories for traffic simulation. All materials are peer-reviewed by SHE’s Automated Vehicles Committee, ensuring technical accuracy and relevance. By lowering the barrier to entry for self-study, SHE contributes to a more diverse and prepared workforce.

Collaborations: Public-Private Partnerships in Action

No single organization can realize the vision of autonomous transportation alone. SHE has established formal partnerships with the U.S. Department of Transportation (USDOT), major automotive OEMs, and leading research universities. These collaborations support pilot programs that test autonomous shuttle services, automated truck platooning, and smart work-zone technologies.

One prominent example is the Midwest Connected Corridor project, a collaboration between SHE, the Ohio Department of Transportation, and a consortium of technology suppliers. On a 35-mile stretch of Interstate 90, the corridor is instrumented with radar sensors, high-definition mapping reference points, and V2I communication nodes. Data from the corridor is used to refine algorithms for lane-keeping and hazard detection. The corridor also serves as a living laboratory for SHE committees evaluating infrastructure durability under heavy truck traffic.

SHE also participates in the National Cooperative Highway Research Program (NCHRP), contributing expert panels for studies on automated vehicle liability, insurance implications for roadway authorities, and gap analysis of existing design standards. In academia, SHE sponsors graduate fellowships and dissertation awards in autonomous systems, fostering the next generation of researchers.

Advancing Infrastructure Design for Autonomy

Autonomous vehicles impose new demands on road geometry and materials. SHE has been at the forefront of developing infrastructure design guidelines specifically for Level 4 and Level 5 operations. These guidelines address lane width optimization for sensor fields of view, intersection layout to reduce perception blind spots, and pavement marking strategies that ensure high-contrast detection by cameras and lidar.

In collaboration with materials scientists, SHE has tested pavement additives that enhance lane-marking reflectivity for lidar returns. Traditional retroreflective beads designed for human headlights can scatter laser pulses, returning weak signals. SHE-funded research has identified alternative bead shapes and binder formulations that double lidar detection range in wet conditions. The findings are being incorporated into state department-of-transportation specifications.

Another area of focus is resilient curb designs for automated loading zones and passenger pick-up/drop-off areas. SHE has published model designs that integrate inductive charging pads, passenger information displays, and secure network connections. These designs are now being used in smart city pilot projects in Austin, Texas, and Columbus, Ohio.

Impact on Transportation Safety and Efficiency

The cumulative work of SHE has produced measurable improvements in road safety and network efficiency. A 2023 analysis of SHE-influenced corridors found that intersections equipped with the society’s V2I standards experienced a 28% reduction in red-light violations and a 15% reduction in angle crashes compared with control corridors. While correlation is not causation, the results align with simulation studies that predict benefits from infrastructure-to-vehicle advisories.

In the realm of efficiency, SHE’s work on adaptive signal timing using connected-vehicle data has shown promise for reducing stop-and-go traffic. A pilot on a major arterial in Virginia demonstrated 12% improvement in average travel time and 8% reduction in fuel consumption during peak hours. These gains were achieved by feeding real-time, anonymized probe data from connected vehicles into the traffic signal controllers, a data-sharing protocol standardized by SHE.

Perhaps less visible but equally important are the safety benefits from training. Engineers who have completed SHE’s certificate courses report higher confidence in designing infrastructure that accommodates both human-driven and autonomous vehicles during the transition period. This reduces the likelihood of safety oversights arising from lack of familiarity with autonomous system behaviors.

Future Directions for the Society of Highway Engineers

Looking ahead, SHE has outlined a five-year strategic plan that targets three major areas. First, the society is investing in edge computing frameworks that allow roadside infrastructure to process sensor data locally, reducing latency and bandwidth requirements. Second, it is developing cybersecurity certification programs for autonomous vehicle infrastructure after a series of vulnerability disclosures in connected traffic signals drew national attention.

Third, SHE aims to expand its global footprint through international harmonization initiatives. As autonomous vehicle developers operate across borders, differing infrastructure standards create friction. SHE is working with standards bodies in Europe and Asia to align message sets and communication protocols, ensuring that vehicles operating in multiple regions can seamlessly interact with local infrastructure.

Another frontier is equitable deployment. SHE has established a task force to study how autonomous transportation systems can avoid exacerbating existing disparities in access to mobility. The task force is developing equity metrics that can be incorporated into infrastructure planning tools, so that deployment decisions consider factors such as route coverage for low-income neighborhoods and accessibility for people with disabilities.

Finally, SHE is expanding its testing and validation programs. A new proving ground in the southwestern United States will allow real-world testing of autonomous trucks on long-haul routes with varied terrain and weather. The facility will include dedicated lanes for automated freight, dynamic tolling systems, and emergency response coordination protocols.

A Foundation for the Autonomous Future

The contributions of the Society of Highway Engineers to autonomous transportation systems extend far beyond any single project or standard. Through sustained investment in research, rigorous standardization efforts, comprehensive training programs, and collaborative partnerships, SHE has built a foundation upon which the autonomous transportation ecosystem can safely and equitably grow. As the technology matures and scales, the society’s work will remain indispensable in bridging the gap between digital intelligence and physical infrastructure.

For transportation professionals seeking to stay current with the latest developments in connected and automated vehicles, resources from the U.S. Department of Transportation’s Automated Vehicles Program and the SAE Levels of Driving Automation provide complementary context. Additionally, the Intelligent Transportation Society of America offers industry updates that align closely with SHE’s infrastructure focus. These resources, combined with SHE’s own publications and training, create a comprehensive toolkit for anyone engaged in the design, implementation, or oversight of autonomous transportation systems.