The Maricopa County Department of Transportation (MCDOT) has awarded OmniTrust the contract to provide the security and authentication backbone for a large-scale vehicle-to-everything (V2X) deployment covering 750 intersections across the greater Phoenix region. The project centers on OmniTrust’s TrafficAuth platform and represents one of the most extensive network V2X rollouts undertaken by a U.S. county transportation agency to date.
A Hybrid Architecture Built for Immediate Scale
The deployment combines two distinct V2X communication modes: network V2X (V2N), which routes communications through existing cellular infrastructure, and direct V2X using the PC5 radio interface, which allows short-range, low-latency vehicle-to-infrastructure communication over the 5.9 GHz band.
The significance of the hybrid model is practical. Agencies adopting V2X via direct communications alone have historically faced a chicken-and-egg barrier: roadside unit infrastructure needs to be built before vehicles can communicate, and vehicles need to be equipped before roadside deployments justify the investment. By extending V2X over cellular networks first, MCDOT can activate connected vehicle services across its existing signal network without waiting for full physical infrastructure buildout at every node.
TrafficAuth handles the security layer across both modes, establishing authenticated, identity-verified communication channels between vehicles, roadside equipment, and traffic management systems. The platform is built on OmniTrust’s Trust Lifecycle Management (TLM) framework and operates using SAE J2735 message standards and the IEEE 1609.2 security specification, both of which are the established baselines for interoperable V2X communication in North America. A Security Credential Management System (SCMS) underpins identity issuance and revocation across the connected network.
What the Deployment Covers at the Intersection Level
The initial operational focus targets four application categories directly tied to safety outcomes and traffic efficiency. Signal priority and preemption for authorized vehicles, including emergency responders and transit fleets, is expected to reduce intersection conflict and improve response times. Real-time safety messaging to drivers and road workers extends situational awareness beyond line-of-sight. A role-based whitelisting mechanism controls which vehicle types can request priority status, preventing unauthorized preemption requests.
The geographic scope spans the Cities of Phoenix, Tolleson, and Avondale, unincorporated areas of Maricopa County, and sections of Arizona Department of Transportation’s US 60 corridor. On the vehicle side, the program initially targets approximately 400 onboard units across transit, emergency, and freight fleets, according to federal project documentation from the Federal Highway Administration (FHWA).
Federal Funding Underpins the Broader Programme
The MCDOT V2X programme is part of the Connected Vehicle Acceleration Zone (CVAZ), a federally funded initiative supported by a $19.6 million cooperative agreement with the U.S. Department of Transportation, awarded under the Saving Lives with Connectivity: Accelerating V2X Deployment programme. The grant was one of three distributed in 2024, with Texas A&M Transportation Institute and the Utah Department of Transportation receiving parallel funding for deployments in Houston and the Mountain West respectively, bringing the total programme value to $60 million.
Maricopa County’s connected vehicle work is not a new initiative. MCDOT has been developing and testing connected vehicle technologies for more than 15 years through its SMARTDrive Programme, giving the county an established foundation in V2X experimentation ahead of this deployment.
OmniTrust’s Role and the Shift from INTEGRITY Security Services
OmniTrust operated until recently as INTEGRITY Security Services (ISS), a company incubated within Green Hills Software that built its credentials in SCMS deployment, public key infrastructure, and certificate lifecycle management for safety-critical systems. The company became an independent entity in late 2024 and formally launched under its current name at RSA Conference in March 2026.
The Maricopa County contract is OmniTrust’s most prominent public transportation deployment under its rebranded identity and positions TrafficAuth as a reference implementation for network V2X security at a county scale. Beyond security primitives, OmniTrust is also presenting TrafficAuth as a platform for third-party application development, with a standardised architecture intended to reduce the integration burden for developers building V2X applications such as vulnerable road user alerts, work zone notifications, and freight signal priority. The aim is to lower the barrier for application-layer innovation on top of an already-secure credential infrastructure.
Why This Deployment Matters for the V2X Market
V2X technology has accumulated years of pilot activity in the United States without transitioning to citywide or county-wide operational scale. Maricopa County’s programme is one of a small number of deployments that directly tests whether a hybrid network-plus-direct approach can bridge the infrastructure gap that has slowed adoption. The selection of a cellular-first security architecture rather than a purely roadside-unit-dependent model reflects a broader shift in how transportation agencies are approaching the deployment economics of connected vehicles.
Kurrant has previously covered early V2X pilot activity, including an exploration of C-V2X technology and vulnerable road user safety pilots at Peachtree Corners’ Curiosity Lab, which illustrates the gap between controlled pilot environments and the operational scale now being attempted in Maricopa County.
The 750-intersection scope, if delivered as specified, would place this among the largest V2X security deployments in the United States by physical coverage and would serve as a data point for other metropolitan counties evaluating hybrid V2X architectures backed by FHWA funding.
