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Cybersecurity for centralised advanced traffic management systems

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article image Moxa’s EDR-810 industrial multi-port secure router was installed in the roadside cabinet of each intersection to provide secure data transmission
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A Moxa EDR-810 industrial multi-port secure router was supplied to Henrico County, Virginia, USA to provide secure data transmission in their new centralised traffic management system.

Many traffic signalling systems across the United States are still managed using master controllers connecting to local traffic controllers via a mix of closed-loop twisted-pair circuits, serial radios, and dial-up services for traffic signal control and coordination. These legacy systems still require frequent onsite maintenance, lack many central monitoring and control capabilities, and are inadequate for system expansions such as adding IP cameras.

Transportation officials of Henrico County, Virginia wanted to upgrade the existing traffic signalling control systems to a centralised advanced traffic management system (ATMS) with NEMA TS2 compliance. Operators at the central command centre would be able to access traffic signals at remote traffic control locations for real-time monitoring and emergency response. This advanced traffic control network was planned to be deployed across a public network and would not only require a highly reliable connection, but also cybersecurity protection to deny unauthorised access.

Henrico County’s existing traffic control system was comprised of 140 signalised intersections, but only 25 intersections were interconnected while the remaining 115 intersections were isolated signal control circuits. The new signalling network would have a centralised architecture, where the central command centre can communicate with each local traffic signal controller. Local traffic controllers will also be able to adjust and schedule traffic signal timing parameters for different times of the day to expedite traffic flow.

For traffic controllers to transmit the data to the traffic operation centre, the system integrator will utilise the existing ISP public network, which requires modems for communication. However, the public network presented possible security threats to the traffic control network. VPN and firewall security measures were therefore, essential to secure data communications.

Moxa’s EDR-810 industrial multi-port secure router, an all-in-one VPN/NAT/firewall/switch device, was installed in the roadside cabinet of each intersection to provide secure data transmission. The EDR-810 offers Turbo Ring and Turbo Chain technologies with less than 20 ms recovery time to ensure network reliability. Also, the EDR-810 supports VPN and firewall capabilities, which will provide secure remote access and critical field device protection.

Moxa’s EDR-810-VPN provides advantages such as up to 10 ports to connect LAN devices; 20 Mbps VPN bandwidth to provide secure VPN tunnelling through the public network between field cabinets and the central command centre; 2 gigabit fibre ports with RSTP and Turbo Ring technology for future expansions; dual redundant power inputs to maximise system uptime; and NEMA TS2 compliance.

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