City Of San Antonio Future-Proofs Traffic Management System With Cradlepoint LTE Networking
With its population rapidly expanding and its traffic management system needing much better reliability and flexibility, the City of San Antonio, Texas, turned to LTE connectivity with Cradlepoint NetCloud Service for IoT, including edge computing, SD-Perimeter technology for device-to-cloud security, and cloud configuration and troubleshooting, all delivered via an IoT gateway with embedded LTE.
Now San Antonio’s traffic network has reliable connectivity with the ability to expand and begin using untapped technology and applications to improve traffic flow and maximize civic resources.
The City of San Antonio, Texas, has a population of more than 1.4 million people — and is expected to grow by at least a million individuals within the next 20 years. Rapid growth required the city to seek smart, efficient expansion of its infrastructure and services. For instance, the city’s Traffic Management Center must be prepared to handle greatly heightened roadway usage.
The Traffic Management Center, with a staff of 16 people overseeing nearly 1,400 intersections, is responsible for traffic signal operations, lane control, the school flasher system, sensor-based detection devices, and nearly 60 video cameras that facilitate real-time monitoring.
The city’s traffic system is finely tuned. Even minor disruptions and technical issues can drastically hinder motorists’ ability to proceed through several green lights in succession
during normal traffic flow.
In 2015, the City of San Antonio recognized the need to upgrade its complex traffic management system, which included a dozen radio towers throughout the city. About 300 intersections, featuring access points connected to wired lines, were serving as reference nodes for the remainder of the intersections, each of which featured a wireless access point.
The resultant radio-based wireless mesh network allowed traffic managers to remotely communicate with devices in the field, but not consistently. The staff could only engage with about 60 percent of the city’s intersections. This proved problematic because remote access is what allows staff at headquarters to centrally monitor key applications, troubleshoot problems, and adjust the clocks that synchronize traffic lights and flow.
“With the reduced communication, the rides that citizens were experiencing on our arterials were becoming poorer and poorer,” said Marc Jacobson, manager of the City of San Antonio’s Traffic Management Center.
Complaints from frustrated citizens were beginning to grow, as was the amount of manhours necessary to send personnel into the field to manually adjust clocks and other settings.
Also contributing to the problem was the department’s lack of a remote cloud management solution.
"It really starts to drain our manpower when we can’t communicate to the intersections," said Jacobson.
The City of San Antonio deployed Cradlepoint NetCloud Service for IoT, delivered through purpose-built routers and cloud configuration and troubleshooting, all delivered via a purpose-built mobile router with embedded LTE, 24x7 support, and a limited lifetime warranty, in nearly 700 traffic cabinets, and implemented LTE as its primary WAN.
Any intersection that doesn’t have a Cradlepoint device has an access point that points toward a Cradlepoint. The access point’s dual-band, dual-concurrent WiFi maintains a more manageable mesh domain with an updated, more reliable connection back to the data center.
Cradlepoint’s cloud management features enables the team to be both reactive and proactive in their management of the city’s traffic system.
Fast, Easy Deployment
During initial deployment of its Cradlepoint devices, the city was forced to make a quick decision to switch 200 Cradlepoint LTE devices from one carrier to another. The change was easy, taking place in just a few days, with support from the Cradlepoint team.
“The fact that we could make that change, from a firmware standpoint, speaks to the adaptability of the product,” said John Rodriguez, the City of San Antonio’s assistant director of infrastructure.
Constant Connectivity For Reliable Access
With constant LTE connectivity through Cradlepoint NetCloud Service for IoT, the Traffic Management Center has been able to boost the city’s rate of communication with intersections from about 60 percent to nearly 100 percent — surpassing administrators’ recent 95 percent mandate.
“That reliability allows us to start to utilize some of the tools in our central management system that we haven’t been able to leverage before, because the data we used to get back wasn’t reliable,” said Jacobson.
Streamlined Network Troubleshooting & Real-Time Management
When a problem arises at an intersection, the traffic management team can investigate from headquarters via live stream, then ascertain whether the situation calls for a simple fix via Cradlepoint’s cloud-management service, NetCloud Manager, or a truck roll.
Compact For Easy Physical Access
From a maintenance standpoint, the Cradlepoint routers’ relatively small size makes physical access and maintenance easy, as it sits near ground level in a traffic cabinet, with an external antenna mounted outside the cabinet.
“With our old installation, it required a bucket truck, and for us to go up 20 feet in the air and to run cable to the infrastructure,” said Jacobson.
Potential to Scale Up Network and Applications
Leveraging Cradlepoint NetCloud Service for IoT helps position the City of San Antonio’s Traffic Management Center to easily scale up its network without sacrificing throughput and speed.
“Intersections are almost like a node in our environment. With cellular, that node can help us plan for the future — traffic today, live security feeds tomorrow,” said Rodriguez.
Constant connectivity and cloud management have opened up a wide variety of possible Smart City LTE applications for the City of San Antonio, including syncing KITS software with Computer-Aided Dispatch (CAD) to provide more granular data about traffic expectations for public safety.
"It has changed our mindset to the point that we are beginning to come up with new ways to utilize the system to make our jobs easier, and to make the ride better for the traveling public," said Jacobson.