Plan for Certificate Replenishment, Status Monitoring Tools, and the Recurring Costs Associated with Security Certificates.
Integrated Data Ecosystem Developed for Increased Real-Time Situational Awareness in Utah.
Utah, United States
Utah Connected
Summary Information
The Utah Department of Transportation (UDOT) was awarded a FY 2018 Advanced Transportation and Congestion Management Technologies Deployment (ATCMTD) grant for seven projects under its Utah Connected initiative.
In the Data Ecosystem project, UDOT developed a cloud-based data analytics platform with the goal of more effectively collecting and providing real-time information and enabling UDOT’s vehicle-to-everything (V2X) deployments.
The Data Ecosystem records all V2X messages received by roadside units (RSUs), including Basic Safety Message (BSM), Signal Request Message (SRM), Signal Status Message (SSM), Signal Phase and Timing (SPaT) message, Map Data (MAP) message, Traveler Information Message (TIM), and Radio Technical Commission for Maritime Services (RTCM). Road Weather Information System (RWIS) sensors, on-board units, roadside units, network switches, signal command modules, and traffic signal controllers were also integrated into the Data Ecosystem.
The UDOT project team identified several lessons learned from the development of the system.
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Plan for certificate replenishment, status monitoring tools, and the recurring costs associated with security certificates. V2X security certificates typically expire every few years. Expired certificates cause devices to ignore messages, disrupting system reliability. Plan for certificate renewal processes, monitoring tools, and ongoing costs.
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Explore offline data storage solutions to complement cloud-based options in the long term. Cloud storage of V2X data creates recurring transmission and storage expenses that are difficult to predict. Determine early which data to store, retention periods, and when to migrate older data to lower-cost offline storage.
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Plan data access as a user-facing function, not only as a technical backend. While the system successfully collected V2X data, access remained difficult for users. Design data sharing, documentation, and dissemination features from the start, especially for external stakeholders.
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Consider factors that impact message transmission periodicity and latency. Message timing and delays are affected by volume, certificate signing, controller capabilities, firmware versions, and hardware limits. Account for these factors in installation and maintenance planning.
