Smart Traffic Management

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Streamline your traffic management, improve traffic flows and reduce accidents with AT&T Smart Traffic Management Solutions powered by Digi

Traffic managers face new challenges with keeping traffic management systems up-to-date. The priorities are to improve traffic flows, reduce congestion and increase safety. To meet these objectives, cities today are retrofitting and upgrading their traffic infrastructure with smart traffic management systems. These adaptive systems gather more citywide data and exert more control at intersections, utilizing a dependable, high-speed communications network and great integration partners.

AT&T and Digi Partnership

AT&T and Digi successfully built, deployed, and managed one of the world’s largest traffic management infrastructure upgrades in the world. This traffic management system controls the traffic signals at over 10,000 intersections, as well as a range of Intelligent Transportation Systems (ITS) devices including traffic cameras, variable message signs and vehicle detection devices. Approved by NASPO as well as AT&T FirstNet, Digi is an award-winning solution to smart traffic management.

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AT&T IoT Professional Services can support any aspect of your deployment, including:

  • Full turnkey deployment and implementation
  • Building a business case and ROI for a smart traffic project
  • Using Digi’s FirstNet® approved network technology to reliably connect signalized intersections
  • Customization, application development and configuration services
  • Integrating existing infrastructure into an IoT platform

With AT&T and Digi’s proven traffic management solution,
cities can address the following needs

Digi provides the communications backbone for high-speed traffic management systems with 99.99% uptime. These high-performance solutions address the demanding requirements of traffic networks, delivering secure, redundant and reliable network communications. Simultaneously, Digi’s traffic solutions prepare Smart Cities for coming technology evolutions, including the deployment of 5G and Connected Vehicle.

Traffic Management Diagram

20 Minutes to Deployment

With the NYC-DOT deployment, installers were able to configure and deploy faster and more effectively with the configuration tools in Digi Remote Manager®.

Centralized Adaptive Control

Using sensors, traffic cameras and fast, reliable cellular communications, adaptive control systems detect vehicle congestion, which triggers changes to traffic signal timing to optimize traffic throughput in real time.

Backhaul Communication

Digi provides guidance on establishing concurrent cellular and fiber links as well as other strategies for continuous, reliable communications with the Traffic Management Center.

FirstNet Trusted™ Device Choices

At the edge of the network are Digi’s routers like the TX54 or the IX20. Both of these solutions are certified FirstNet Trusted™, providing reliable, preemptive communications for public emergencies.

Aging Network Replacement

Many intersections are connected with expensive, aging and sunsetting networks. AT&T can provide a dependable, high-speed communications network, which is critical for the traffic management system to function more efficiently.

The Benefits of Rethinking Smart City Solutions

Existing traffic management systems generally make use of legacy communications networks for traffic signal coordination and system management. Near real-time, reliable communications has not historically been a core requirement of these networks, and aging infrastructures are experiencing failures. The Smart City movement has brought about a paradigm shift, where basic pre-programmed operation is no longer sufficient. New applications and technology utilizing reliable broadband communications have been proven to deliver enormous benefits for reduced congestion, improved safety and more.

Connected Vehicle

A key objective is to prevent accidents through near real time communication between vehicles, pedestrians (smart phones) and the traffic control system.

Congestion Detection

Traditional single-vehicle detector loops are replaced with radar and camera systems, enabling detection of entire vehicle queues and therefore congestion.

Emergency Routing

A path through the city is coordinated for first responder vehicles, using congestion data and vehicle location to adapt route guidance and traffic signal timing.

Bus Rapid Transit

Traffic signal timing is adjusted to maintain schedules of BRT transit buses.


Mission-critical IP backbone supports future IOT and transportation applications including traffic analytics, emergency preemption, and automated cellular failover in the event of a fiber / cable cut.

Safer Transportation

Increased surface transportation capacity to support new residents and businesses as well as vulnerable road users (pedestrians, cyclists, e-scooters).

Traffic Management Diagram
The Traffic Management Center (TMC) is the central facility where vehicle and pedestrian movement is monitored and controlled. AT&T FirstNet® connectivity powered by Digi provides secure and reliable communications between intersection equipment and the TMC.

Network Resiliency with Digi

Running large and diverse cellular communications networks that meet acceptable availability requirements demands a high level of automation, a highly reliable software/hardware platform and network fault redundancy, as well as great management tools and informative performance metrics. The network infrastructure includes cloud-hosted Digi Remote Manager® and a Digi router at each intersection, delivering superior performance and scalability over the AT&T FirstNet® network.

Traffic Management Diagram

Deployment Approach

Fortunately, modern infrastructure systems such as traffic management are predominately IP-based, so the operation of one subsystem is often independent of other subsystems. This is the case for the communications network. AT&T field service can upgrade communication equipment without disruption to existing traffic management systems.

Installation of field equipment is straightforward. The Digi router and power supply are situated on a shelf within the cabinet, and connect to existing equipment by Ethernet, serial or USB cable. The antenna is fixed to the cabinet roof, with the RF cables entering the cabinet via a threaded through-hole stud mount, sealed to prevent water ingress into the cabinet. Site activation is aided by automated configuration updates using Digi Remote Manager (Digi RM). Any site-unique parameters are preloaded into Digi RM, and automatically download when the router first connects. Dashboards show connection status and key performance data, designed to spot trouble if present. A quick speed test can confirm full operation in preparation for site commissioning.

Future-proof Cities

City managers face a growing number of challenges, especially with the trend toward urbanization. A dependable, high-speed communications network is critical for the traffic management system to function more efficiently. AT&T and Digi have a proven record of working with cities and municipalities to design, build and deploy connected traffic management solutions.

Departments of Transportation on the cutting edge of this movement will see better traffic flow, improved emergency response and a reduction in traffic accidents. Now is the optimal time to deploy the communications technologies that support these fast moving initiatives, and AT&T and Digi can help.

Ready To Get Started?
Get in touch with a qualified sales specialist